Add changelog

Author: avh4

CHANGELOG.md

@@ -0,0 +1,15 @@
+
+## 0.3.1-alpha
+
+ - BUG: Fixed formatting of the following code (in 0.3.0-alpha it would format to invalid syntax) [#179](https://github.com/avh4/elm-format/issues/179)
+
+        import Dict as D
+            exposing
+                ( empty
+                , fromList
+                )
+
+
+## 0.3.0-alpha
+
+See https://github.com/avh4/elm-format/releases/tag/0.3.0-alpha