Update changelog

CHANGELOG.md

@@ -6,7 +6,10 @@ To install or update CocoaPods see this [guide](http://docs.cocoapods.org/guides
 
 ###### Enhancements
 
-* Pod headers are now provided to the user target as a system header. This means that any warnings in the Pod's code will show under their target in Xcode's build navigator, and never under the user target.
+* Pod headers are now provided to the user target as a system
+  header. This means that any warnings in a Pod's code will show
+  under its target in Xcode's build navigator, and never under the
+  user target. 
   [Swizzlr](https://github.com/swizzlr)
   [#1596](https://github.com/CocoaPods/CocoaPods/pull/1596)