Add InterruptNumber to CHANGELOG
@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
## [Unreleased]
+### Added
+
+- New `InterruptNumber` trait is now required on interrupt arguments to the
+ various NVIC functions, replacing the previous use of `Nr` from bare-metal.
+
## [v0.6.2] - 2020-01-12
### Added
