doc : CHANGELOG updated

Author: sepandhaghighi

CHANGELOG.md

@@ -17,6 +17,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - All parameters moved to `orangetool_params.py`
 - `ADDRESS` parameter renamed to `address`
 - `Zone` parameter renamed to `zone`
+- Docstrings updated
 ## [0.35] - 2019-06-01
 ### Added
 - `version_check.py`