Update version to 0.22.1

CHANGELOG.md

@@ -4,6 +4,13 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.22.1] - 2023-05-08
+### Fixed
+- Fix `poll_flush` on a closed connection.
+
+### Changed
+- Add MSRV to Cargo.toml and check it with the CI.
+
 ## [0.22.0] - 2023-04-27
 ### Changed
 - Update to tokio-rustls 0.24
@@ -141,7 +148,8 @@ No changelog is available for older versions as of yet.
 -->
 
 
-[Unreleased]: https://github.com/sdroege/async-tungstenite/compare/0.22.0...HEAD
+[Unreleased]: https://github.com/sdroege/async-tungstenite/compare/0.22.1...HEAD
+[0.22.1]: https://github.com/sdroege/async-tungstenite/compare/0.22.1...0.22.0
 [0.22.0]: https://github.com/sdroege/async-tungstenite/compare/0.22.0...0.21.0
 [0.21.0]: https://github.com/sdroege/async-tungstenite/compare/0.21.0...0.20.0
 [0.20.0]: https://github.com/sdroege/async-tungstenite/compare/0.20.0...0.19.0

Cargo.toml

@@ -8,7 +8,7 @@ license = "MIT"
 homepage = "https://github.com/sdroege/async-tungstenite"
 repository = "https://github.com/sdroege/async-tungstenite"
 documentation = "https://docs.rs/async-tungstenite"
-version = "0.22.0"
+version = "0.22.1"
 edition = "2018"
 readme = "README.md"
 include = ["examples/**/*", "src/**/*", "LICENSE", "README.md", "CHANGELOG.md"]