Update CHANGELOG.md

Author: dwhinham

CHANGELOG.md

@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.2.1] - 2020-07-14
+
+### Fixed
+
+- Crash when using `resampler_quality = none` - thanks @nswaldman.
+
 ## [0.2.0] - 2020-07-14
 
 ### Added
@@ -20,6 +26,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Initial version.
 
-[unreleased]: https://github.com/dwhinham/mt32-pi/compare/v0.2.0...HEAD
+[unreleased]: https://github.com/dwhinham/mt32-pi/compare/v0.2.1...HEAD
+[0.2.1]: https://github.com/dwhinham/mt32-pi/compare/v0.2.0..v0.2.1
 [0.2.0]: https://github.com/dwhinham/mt32-pi/compare/v0.1.0..v0.2.0
 [0.1.0]: https://github.com/dwhinham/mt32-pi/releases/tag/v0.1.0