Update changelog

Author: Luc Dion

CHANGELOG.md

@@ -8,7 +8,7 @@
 # Change Log
 
 ## [1.7.7](https://github.com/layoutBox/PinLayout/releases/tag/1.7.6)
-Released on 2018-06-18
+Released on 2018-06-19
 
 #### Refactoring using generics
 Refactoring to avoid having to deal directly with view types, making it easier to extend layouting to other APIs (e.g: CALayer)