Update the CHANGELOG as well

Author: kellerkindt

CHANGELOG.md

@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+## [v0.5.7] - 2018-09-06
+
+### Added
+
+- `DCB::enable_trace()` and `DCB::disable_trace()`
+
 ## [v0.5.6] - 2018-08-27
 
 ### Fixed
@@ -497,7 +503,8 @@ fn main() {
 - Functions to get the vector table
 - Wrappers over miscellaneous instructions like `bkpt`
 
-[Unreleased]: https://github.com/rust-embedded/cortex-m/compare/v0.5.6...HEAD
+[Unreleased]: https://github.com/rust-embedded/cortex-m/compare/v0.5.7...HEAD
+[v0.5.7]: https://github.com/rust-embedded/cortex-m/compare/v0.5.6...v0.5.7
 [v0.5.6]: https://github.com/rust-embedded/cortex-m/compare/v0.5.5...v0.5.6
 [v0.5.5]: https://github.com/rust-embedded/cortex-m/compare/v0.5.4...v0.5.5
 [v0.5.4]: https://github.com/rust-embedded/cortex-m/compare/v0.5.3...v0.5.4