Add changelog, update readme

Author: antew

CHANGELOG.md

@@ -0,0 +1,8 @@
+# Changelog
+
+## Version 0.2 - 2019-02-27
+* Update for compatibility with the latest ALE version
+
+## Version 0.1 - 2019-01-26
+* Initial release
+

README.md

@@ -2,6 +2,8 @@
 
 This plugin adds support for linting through [ALE](https://github.com/w0rp/ale) with [elm-analyse](https://github.com/stil4m/elm-analyse).
 
+### ** Only Elm 0.19 is supported by this plugin **
+
 # Installation
 
 ## vim-elm-analyse