Bump version to v0.9.0

Author: robyoung

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+## [0.9.0] - 2021-04-29
+
 ### Added
 
 - Add `microbit::gpio` module with pins mapped to micro:bit names
@@ -19,4 +21,5 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Fix rustdoc warnings
 - Upgrade nrf51-hal to 0.12.1
 
-[Unreleased]: https://github.com/therealprof/microbit/compare/v0.8.0...HEAD
+[Unreleased]: https://github.com/therealprof/microbit/compare/v0.9.0...HEAD
+[0.9.0]: https://github.com/therealprof/microbit/compare/v0.8.0...v0.9.0

Cargo.toml

@@ -17,7 +17,7 @@ license = "0BSD"
 name = "microbit"
 readme = "README.md"
 repository = "https://github.com/therealprof/microbit"
-version = "0.8.0"
+version = "0.9.0"
 
 [dependencies]
 cortex-m = "0.6.1"