Update CHANGELOG.md

Author: Kully

Diff for: CHANGELOG.md

@@ -3,6 +3,9 @@ All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
+### Updated
+- `FF.create_violin` and `FF.create_scatterplotmatrix` now by default do not print subplot grid information in output
+
 ### Added
 - Plot configuration options for offline plots. See the list of [configuration options](https://github.com/Rikorose/plotly.py/blob/master/plotly/offline/offline.py#L189) and [examples](https://plot.ly/javascript/configuration-options/) for more information. 
 	- Please note that these configuration options are for offline plots ONLY. For configuration options when embedding online plots please see our [embed tutorial](http://help.plot.ly/embed-graphs-in-websites/#step-8-customize-the-iframe).