Merge pull request #648 from sfackler/dependabot/cargo/hmac-0.9

Update hmac requirement from 0.8 to 0.9

Author: sfackler

postgres-protocol/Cargo.toml

@@ -13,7 +13,7 @@ base64 = "0.12"
 byteorder = "1.0"
 bytes = "0.5"
 fallible-iterator = "0.2"
-hmac = "0.8"
+hmac = "0.9"
 md5 = "0.7"
 memchr = "2.0"
 rand = "0.7"