added source maps (#19)

Author: AlexGalichenko

CHANGELOG.md

@@ -12,6 +12,9 @@ Check [Keep a Changelog](http://keepachangelog.com/) for recommendations on how
 
 :pencil: - chore
 
+## 1.1.0
+- :rocket: added source maps
+
 ## 1.0.0
 - :rocket: improved error message if poll promise is not resolved in time