Add change log reference

Author: TerryKern

README.md

@@ -17,6 +17,12 @@ Documentation
 
 Check out the [documentation](docs/Home.md) on how to use this library.
 
+
+Change log
+----------
+
+Please see [CHANGELOG](CHANGELOG.md) for more information on what has changed recently.
+
 TODO
 ----
 
@@ -39,4 +45,4 @@ Datatrans Authorisation by Ibrows
 https://github.com/ibrows/datatrans
 
 Datatrans Symfony2 bundle by Valiton
-https://github.com/valiton/DatatransBundle
+https://github.com/valiton/DatatransBundle