support mysq_async 0.36 (#400)

Author: jxs

refinery_core/Cargo.toml

@@ -37,7 +37,7 @@ native-tls = { version = "0.2", optional = true }
 postgres-native-tls = { version = "0.5", optional = true}
 tokio-postgres = { version = ">= 0.5, <= 0.7", optional = true }
 mysql = { version = ">= 21.0.0, <= 26", optional = true, default-features = false, features = ["minimal"] }
-mysql_async = { version = ">= 0.28, <= 0.35", optional = true, default-features = false, features = ["minimal"] }
+mysql_async = { version = ">= 0.28, <= 0.36", optional = true, default-features = false, features = ["minimal"] }
 tiberius = { version = ">= 0.7, <= 0.12", optional = true, default-features = false }
 tokio = { version = "1.0", optional = true }
 futures = { version = "0.3.16", optional = true, features = ["async-await"] }