add release date

Author: jtnelson

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Changelog
 
-#### Version 1.3.0 (TBD)
+#### Version 1.3.0 (November 23, 2018)
 * Added the `ScriptedTransformer` framework. `ScriptedTransformer` is abstract class that can be extended to provide transformation logic via a script that is compatible with the Java script engine platform. Right now, javascript is the supported language for writing transformer scripts.
 * Added support for Transformer serialization. The rules of serialization are:
   * All built-in transformers provided in the `Transformers` factory class are serializable.