Mentioned Swift + Rxswift support in changelog file

Author: bobgodwinx

Changelog.md

@@ -6,6 +6,8 @@ Current master
 3.6.0
 -----
 - Updated `Semantic Versioning` to reflect what is actaully released both on `Pod`  and `Carthage`
+- Added full support for Swift 4.1
+- Added full support for RxSwift 4.2.0
 - UIRefreshControl support: binding to an action (or CocoaAction) starts the action itself and updates the control's refreshing status 
 
 3.5.0