Update CHANGELOG.md

Author: AdinAck

CHANGELOG.md

@@ -6,16 +6,18 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
+### Added
 
 ### Changed
-
 - Updated the `cast` dependency from 0.2 to 0.3
+- Fixed typo in setup of complementary channels
 
 ### Added
 
 - Provide getters to serial status flags idle/txe/rxne/tc.
 - Provide ability to reset timer UIF interrupt flag
 - PWM complementary output capability for TIM1 with new example to demonstrate
+- Very simple dead time control of complementary PWM channels
 
 ### Fixed