Bump micro version

Author: blackbeam

Cargo.toml

@@ -7,7 +7,7 @@ license = "MIT/Apache-2.0"
 name = "mysql_async"
 readme = "README.md"
 repository = "https://github.com/blackbeam/mysql_async"
-version = "0.28.0"
+version = "0.28.1"
 exclude = ["test/*"]
 edition = "2018"
 categories = ["asynchronous", "database"]