Added link to docs. Bump patch version, update change log.

Author: MabezDev

CHANGELOG.md

@@ -5,6 +5,9 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+## [v0.2.2] - 2018-08-25
+    - Fixed documentation link in readme.
+
 ## [v0.2.1] - 2018-08-25
 
 ### Added
@@ -38,7 +41,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 - Initial release
 
-[Unreleased]: https://github.com/mabezdev/stm32l432xx-hal/compare/v0.2.1...HEAD
+[Unreleased]: https://github.com/mabezdev/stm32l432xx-hal/compare/v0.2.2...HEAD
+[v0.2.2]: https://github.com/mabezdev/stm32l432xx-hal/compare/v0.2.1...v0.2.2
 [v0.2.1]: https://github.com/mabezdev/stm32l432xx-hal/compare/v0.2.0...v0.2.1
 [v0.2.0]: https://github.com/mabezdev/stm32l432xx-hal/compare/v0.1.1...v0.2.0
 [v0.1.1]: https://github.com/mabezdev/stm32l432xx-hal/compare/v0.1.0...v0.1.1