PLD-3 Update CHANGELOG

Author: Sergey Podgornyy

docs/CHANGELOG.md

@@ -9,6 +9,12 @@ Updates should follow the [Keep a CHANGELOG](http://keepachangelog.com/) princip
 ### Added
 - Ability to add custom options while connection using `ConnectionManager`
 
+### Removed
+- Useless `private` method `setConnection` in `ConnectionManager`
+
+### Fixed
+- Code readability
+
 ## 2017-11-22
 
 ### Deprecated