add to changelog

Author: L0neGamer

mono-traversable/ChangeLog.md

@@ -2,6 +2,9 @@
 
 ## 1.1.0.0
 
+* Added `Semigroup` superclass for `GrowingAppend`
+  [#248](https://github.com/snoyberg/mono-traversable/pull/248)
+
 ## 1.0.20.0
 
 * Added instances for [`Reverse`](https://hackage.haskell.org/package/transformers-0.6.1.1/docs/Data-Functor-Reverse.html#t:Reverse) data structure.