diff --git a/Cargo.lock b/Cargo.lock
index 463e976..a32045f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -26,15 +26,15 @@ dependencies = [
 
 [[package]]
 name = "arc-swap"
-version = "0.4.4"
+version = "0.4.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d7b8a9123b8027467bce0099fe556c628a53c8d83df0507084c31e9ba2e39aff"
+checksum = "d663a8e9a99154b5fb793032533f6328da35e23aac63d5c152279aa8ba356825"
 
 [[package]]
 name = "async-trait"
-version = "0.1.24"
+version = "0.1.29"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "750b1c38a1dfadd108da0f01c08f4cdc7ff1bb39b325f9c82cc972361780a6e1"
+checksum = "bab5c215748dc1ad11a145359b1067107ae0f8ca5e99844fa64067ed5bf198e3"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -66,9 +66,9 @@ checksum = "f8aac770f1885fd7e387acedd76065302551364496e46b3dd00860b2f8359b9d"
 
 [[package]]
 name = "backtrace"
-version = "0.3.45"
+version = "0.3.46"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ad235dabf00f36301792cfe82499880ba54c6486be094d1047b02bacb67c14e8"
+checksum = "b1e692897359247cc6bb902933361652380af0f1b7651ae5c5013407f30e109e"
 dependencies = [
  "backtrace-sys",
  "cfg-if",
@@ -78,9 +78,9 @@ dependencies = [
 
 [[package]]
 name = "backtrace-sys"
-version = "0.1.33"
+version = "0.1.35"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e17b52e737c40a7d75abca20b29a19a0eb7ba9fc72c5a72dd282a0a3c2c0dc35"
+checksum = "7de8aba10a69c8e8d7622c5710229485ec32e9d55fdad160ea559c086fdcd118"
 dependencies = [
  "cc",
  "libc",
@@ -143,7 +143,7 @@ dependencies = [
  "block-padding",
  "byte-tools",
  "byteorder",
- "generic-array 0.12.3",
+ "generic-array",
 ]
 
 [[package]]
@@ -189,15 +189,6 @@ version = "0.5.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "130aac562c0dd69c56b3b1cc8ffd2e17be31d0b6c25b61c96b76231aa23e39e1"
 
-[[package]]
-name = "c2-chacha"
-version = "0.2.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "214238caa1bf3a496ec3392968969cab8549f96ff30652c9e56885329315f6bb"
-dependencies = [
- "ppv-lite86",
-]
-
 [[package]]
 name = "cc"
 version = "1.0.50"
@@ -317,15 +308,15 @@ version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4434400df11d95d556bac068ddfedd482915eb18fe8bea89bc80b6e4b1c179e5"
 dependencies = [
- "generic-array 0.12.3",
+ "generic-array",
  "subtle",
 ]
 
 [[package]]
 name = "deflate"
-version = "0.8.3"
+version = "0.8.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "050ef6de42a33903b30a7497b76b40d3d58691d4d3eec355348c122444a388f0"
+checksum = "e7e5d2a2273fed52a7f947ee55b092c4057025d7a3e04e5ecdbd25d6c3fb1bd7"
 dependencies = [
  "adler32",
  "byteorder",
@@ -337,7 +328,7 @@ version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f3d0c8c8752312f9713efd397ff63acb9f85585afbf179282e720e7704954dd5"
 dependencies = [
- "generic-array 0.12.3",
+ "generic-array",
 ]
 
 [[package]]
@@ -531,15 +522,6 @@ dependencies = [
  "typenum",
 ]
 
-[[package]]
-name = "generic-array"
-version = "0.13.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0ed1e761351b56f54eb9dcd0cfaca9fd0daecf93918e1cfc01c8a3d26ee7adcd"
-dependencies = [
- "typenum",
-]
-
 [[package]]
 name = "getrandom"
 version = "0.1.14"
@@ -563,9 +545,9 @@ dependencies = [
 
 [[package]]
 name = "h2"
-version = "0.2.2"
+version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9d5c295d1c0c68e4e42003d75f908f5e16a1edd1cbe0b0d02e4dc2006a384f47"
+checksum = "377038bf3c89d18d6ca1431e7a5027194fbd724ca10592b9487ede5e8e144f42"
 dependencies = [
  "bytes",
  "fnv",
@@ -577,7 +559,7 @@ dependencies = [
  "log 0.4.8",
  "slab",
  "tokio",
- "tokio-util 0.2.0",
+ "tokio-util",
 ]
 
 [[package]]
@@ -613,9 +595,9 @@ dependencies = [
 
 [[package]]
 name = "hermit-abi"
-version = "0.1.8"
+version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1010591b26bbfe835e9faeabeb11866061cc7dcebffd56ad7d0942d0e61aefd8"
+checksum = "725cf19794cf90aa94e65050cb4191ff5d8fa87a498383774c47b332e3af952e"
 dependencies = [
  "libc",
 ]
@@ -643,9 +625,9 @@ dependencies = [
 
 [[package]]
 name = "http"
-version = "0.2.0"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b708cc7f06493459026f53b9a61a7a121a5d1ec6238dee58ea4941132b30156b"
+checksum = "28d569972648b2c512421b5f2a405ad6ac9666547189d0c5477a3f200f3e02f9"
 dependencies = [
  "bytes",
  "fnv",
@@ -679,9 +661,9 @@ dependencies = [
 
 [[package]]
 name = "hyper"
-version = "0.13.3"
+version = "0.13.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e7b15203263d1faa615f9337d79c1d37959439dc46c2b4faab33286fadc2a1c5"
+checksum = "ed6081100e960d9d74734659ffc9cc91daf1c0fc7aceb8eaa94ee1a3f5046f2e"
 dependencies = [
  "bytes",
  "futures-channel",
@@ -714,9 +696,9 @@ dependencies = [
 
 [[package]]
 name = "image"
-version = "0.23.1"
+version = "0.23.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "403f0c29211dc50a78eb53eeeae87945d44cb63071881834212f36677fccb2b4"
+checksum = "bfc5483f8d5afd3653b38a196c52294dcb239c3e1a5bade1990353ea13bcf387"
 dependencies = [
  "bytemuck",
  "byteorder",
@@ -813,9 +795,9 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
 name = "libc"
-version = "0.2.67"
+version = "0.2.68"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eb147597cdf94ed43ab7a9038716637d2d1bf2bc571da995d0028dec06bd3018"
+checksum = "dea0c0405123bba743ee3f91f49b1c7cfb684eef0da0a50110f758ccf24cdff0"
 
 [[package]]
 name = "lock_api"
@@ -891,11 +873,11 @@ checksum = "3728d817d99e5ac407411fa471ff9800a778d88a24685968b36824eaf4bee400"
 
 [[package]]
 name = "memoffset"
-version = "0.5.3"
+version = "0.5.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "75189eb85871ea5c2e2c15abbdd541185f63b408415e5051f5cac122d8c774b9"
+checksum = "b4fc2c02a7e374099d4ee95a193111f72d2110197fe200272371758f6c3643d8"
 dependencies = [
- "rustc_version",
+ "autocfg 1.0.0",
 ]
 
 [[package]]
@@ -1070,9 +1052,9 @@ dependencies = [
 
 [[package]]
 name = "num-rational"
-version = "0.2.3"
+version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "da4dc79f9e6c81bef96148c8f6b8e72ad4541caa4a24373e900a36da07de03a3"
+checksum = "5c000134b5dbf44adc5cb772486d335293351644b801551abe8f75c84cfa4aef"
 dependencies = [
  "autocfg 1.0.0",
  "num-integer",
@@ -1208,7 +1190,7 @@ version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c00cf8b9eafe68dde5e9eaa2cef8ee84a9336a47d566ec55ca16589633b65af7"
 dependencies = [
- "siphasher 0.3.1",
+ "siphasher 0.3.2",
 ]
 
 [[package]]
@@ -1245,9 +1227,9 @@ checksum = "5894c618ce612a3fa23881b152b608bafb8c56cfc22f434a3ba3120b40f7b587"
 
 [[package]]
 name = "png"
-version = "0.16.1"
+version = "0.16.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "46060468187c21c00ffa2a920690b29997d7fd543f5a4d400461e4a7d4fccde8"
+checksum = "910f09135b1ed14bb16be445a8c23ddf0777eca485fbfc7cee00d81fecab158a"
 dependencies = [
  "bitflags",
  "crc32fast",
@@ -1257,15 +1239,14 @@ dependencies = [
 
 [[package]]
 name = "postgres-protocol"
-version = "0.5.0"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a30f0e172ae0fb0653dbf777ad10a74b8e58d6de95a892f2e1d3e94a9df9a844"
+checksum = "3f611afe4d1407ebe7f3ced1ffc66f730fac1b1c13085e230a8cdcb921e97710"
 dependencies = [
- "base64 0.11.0",
+ "base64 0.12.0",
  "byteorder",
  "bytes",
  "fallible-iterator",
- "generic-array 0.13.2",
  "hmac",
  "md5",
  "memchr",
@@ -1303,26 +1284,21 @@ dependencies = [
 
 [[package]]
 name = "proc-macro-hack"
-version = "0.5.11"
+version = "0.5.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ecd45702f76d6d3c75a80564378ae228a85f0b59d2f3ed43c91b4a69eb2ebfc5"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
-]
+checksum = "0d659fe7c6d27f25e9d80a1a094c223f5246f6a6596453e09d7229bf42750b63"
 
 [[package]]
 name = "proc-macro-nested"
-version = "0.1.3"
+version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "369a6ed065f249a159e06c45752c780bda2fb53c995718f9e484d08daa9eb42e"
+checksum = "8e946095f9d3ed29ec38de908c22f95d9ac008e424c7bcae54c75a79c527c694"
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.9"
+version = "1.0.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6c09721c6781493a2a492a96b5a5bf19b65917fe6728884e7c44dd0c60ca3435"
+checksum = "df246d292ff63439fea9bc8c0a270bed0e390d5ebd4db4ba15aba81111b5abe3"
 dependencies = [
  "unicode-xid",
 ]
@@ -1343,9 +1319,9 @@ dependencies = [
 
 [[package]]
 name = "protobuf"
-version = "2.10.2"
+version = "2.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "37a5325d019a4d837d3abde0a836920f959e33d350f77b5f1e289e061e774942"
+checksum = "71964f34fd51cf04882d7ae3325fa0794d4cad66a03d0003f38d8ae4f63ba126"
 
 [[package]]
 name = "quick-error"
@@ -1389,7 +1365,7 @@ checksum = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
 dependencies = [
  "getrandom",
  "libc",
- "rand_chacha 0.2.1",
+ "rand_chacha 0.2.2",
  "rand_core 0.5.1",
  "rand_hc 0.2.0",
 ]
@@ -1406,11 +1382,11 @@ dependencies = [
 
 [[package]]
 name = "rand_chacha"
-version = "0.2.1"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "03a2a90da8c7523f554344f921aa97283eadf6ac484a6d2a7d0212fa7f8d6853"
+checksum = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
 dependencies = [
- "c2-chacha",
+ "ppv-lite86",
  "rand_core 0.5.1",
 ]
 
@@ -1550,9 +1526,9 @@ checksum = "2439c63f3f6139d1b57529d16bc3b8bb855230c8efcc5d3a896c8bea7c3b1e84"
 
 [[package]]
 name = "regex"
-version = "1.3.4"
+version = "1.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "322cf97724bea3ee221b78fe25ac9c46114ebb51747ad5babd51a2fc6a8235a8"
+checksum = "7f6946991529684867e47d86474e3a6d0c0ab9b82d5821e314b1ede31fa3a4b3"
 dependencies = [
  "aho-corasick",
  "memchr",
@@ -1572,9 +1548,9 @@ dependencies = [
 
 [[package]]
 name = "regex-syntax"
-version = "0.6.16"
+version = "0.6.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1132f845907680735a84409c3bebc64d1364a5683ffbce899550cd09d5eaefc1"
+checksum = "7fe5bd57d1d7414c6b5ed48563a2c855d995ff777729dcd91c369ec7fea395ae"
 
 [[package]]
 name = "remove_dir_all"
@@ -1591,15 +1567,6 @@ version = "0.1.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4c691c0e608126e00913e33f0ccf3727d5fc84573623b8d65b2df340b5201783"
 
-[[package]]
-name = "rustc_version"
-version = "0.2.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "138e3e0acb6c9fb258b19b67cb8abd63c00679d2851805ea151465464fe9030a"
-dependencies = [
- "semver",
-]
-
 [[package]]
 name = "rustdct"
 version = "0.4.0"
@@ -1651,9 +1618,9 @@ dependencies = [
 
 [[package]]
 name = "ryu"
-version = "1.0.2"
+version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bfa8506c1de11c9c4e4c38863ccbe02a305c8188e85a05a784c9e11e1c3910c8"
+checksum = "535622e6be132bccd223f4bb2b8ac8d53cda3c7a6394944d3b2b33fb974f9d76"
 
 [[package]]
 name = "safemem"
@@ -1679,35 +1646,20 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
 
-[[package]]
-name = "semver"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1d7eb9ef2c18661902cc47e535f9bc51b78acd254da71d375c2f6720d9a40403"
-dependencies = [
- "semver-parser",
-]
-
-[[package]]
-name = "semver-parser"
-version = "0.7.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
-
 [[package]]
 name = "serde"
-version = "1.0.104"
+version = "1.0.106"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "414115f25f818d7dfccec8ee535d76949ae78584fc4f79a6f45a904bf8ab4449"
+checksum = "36df6ac6412072f67cf767ebbde4133a5b2e88e76dc6187fa7104cd16f783399"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.104"
+version = "1.0.106"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "128f9e303a5a29922045a830221b8f78ec74a5f544944f3d5984f8ec3895ef64"
+checksum = "9e549e3abf4fb8621bd1609f11dfc9f5e50320802273b12f3811a67e6716ea6c"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1716,9 +1668,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.48"
+version = "1.0.51"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9371ade75d4c2d6cb154141b9752cf3781ec9c05e0e5cf35060e1e70ee7b9c25"
+checksum = "da07b57ee2623368351e9a0488bb0b261322a15a6e0ae53e243cbdc0f4208da9"
 dependencies = [
  "itoa",
  "ryu",
@@ -1788,9 +1740,9 @@ checksum = "0b8de496cf83d4ed58b6be86c3a275b8602f6ffe98d3024a869e124147a9a3ac"
 
 [[package]]
 name = "siphasher"
-version = "0.3.1"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "83da420ee8d1a89e640d0948c646c1c088758d3a3c538f943bfa97bdac17929d"
+checksum = "8e88f89a550c01e4cd809f3df4f52dc9e939f3273a2017eabd5c6d12fd98bb23"
 
 [[package]]
 name = "slab"
@@ -1806,9 +1758,9 @@ checksum = "5c2fb2ec9bcd216a5b0d0ccf31ab17b5ed1d627960edff65bbe95d3ce221cefc"
 
 [[package]]
 name = "socket2"
-version = "0.3.11"
+version = "0.3.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e8b74de517221a2cb01a53349cf54182acdc31a074727d3079068448c0676d85"
+checksum = "03088793f677dce356f3ccc2edb1b314ad191ab702a5de3faf49304f7e104918"
 dependencies = [
  "cfg-if",
  "libc",
@@ -1846,9 +1798,9 @@ checksum = "2d67a5a62ba6e01cb2192ff309324cb4875d0c451d55fe2319433abe7a05a8ee"
 
 [[package]]
 name = "syn"
-version = "1.0.16"
+version = "1.0.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "123bd9499cfb380418d509322d7a6d52e5315f064fe4b3ad18a53d6b92c07859"
+checksum = "0df0eb663f387145cab623dea85b09c2c5b4b0aef44e945d928e682fce71bb03"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1921,9 +1873,9 @@ dependencies = [
 
 [[package]]
 name = "tokio"
-version = "0.2.13"
+version = "0.2.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0fa5e81d6bc4e67fe889d5783bd2a128ab2e0cfa487e0be16b6a8d177b101616"
+checksum = "ee5a0dd887e37d37390c13ff8ac830f992307fe30a1fff0ab8427af67211ba28"
 dependencies = [
  "bytes",
  "fnv",
@@ -1973,7 +1925,7 @@ dependencies = [
  "postgres-protocol",
  "postgres-types",
  "tokio",
- "tokio-util 0.3.0",
+ "tokio-util",
 ]
 
 [[package]]
@@ -1991,23 +1943,9 @@ dependencies = [
 
 [[package]]
 name = "tokio-util"
-version = "0.2.0"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "571da51182ec208780505a32528fc5512a8fe1443ab960b3f2f3ef093cd16930"
-dependencies = [
- "bytes",
- "futures-core",
- "futures-sink",
- "log 0.4.8",
- "pin-project-lite",
- "tokio",
-]
-
-[[package]]
-name = "tokio-util"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "af67cdce2b40f8dffb0ee04c853a24217b5d0d3e358f0f5ccc0b5332174ed9a8"
+checksum = "be8242891f2b6cbef26a2d7e8605133c2c554cd35b3e4948ea892d6d68436499"
 dependencies = [
  "bytes",
  "futures-core",
@@ -2098,9 +2036,9 @@ dependencies = [
 
 [[package]]
 name = "tracing-subscriber"
-version = "0.2.3"
+version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dedebcf5813b02261d6bab3a12c6a8ae702580c0405a2e8ec16c3713caf14c20"
+checksum = "cfc50df245be6f0adf35c399cb16dea60e2c7d6cc83ff5dc22d727df06dd6f0c"
 dependencies = [
  "ansi_term",
  "chrono",
@@ -2340,9 +2278,9 @@ checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
 
 [[package]]
 name = "winapi-util"
-version = "0.1.3"
+version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4ccfbf554c6ad11084fb7517daca16cfdcaccbdadba4fc336f032a8b12c2ad80"
+checksum = "fa515c5163a99cc82bab70fd3bfdd36d827be85de63737b40fcef2ce084a436e"
 dependencies = [
  "winapi 0.3.8",
 ]