update CHANGELOG and optional requirements for tests

Author: yankev

CHANGELOG.md

@@ -2,6 +2,17 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## [1.12.3] - 2016-06-30
+### Updated
+- Updated `plotly.min.js` from 1.13.0 to 1.14.1
+	- Numerous additions and changes where made to the mapbox layout layers attributes
+	- Attribute line.color in scatter3d traces now support color scales
+	- Layout shapes can now be moved and resized (except for 'path' shapes) in editable contexts
+	- See [the plotly.js CHANGELOG](https://github.com/plotly/plotly.js/blob/master/CHANGELOG.md#1141----2016-06-28) for additional information regarding the updates
+- Added `update_offline` in makefile in order to automate updating `plotly.min.js` for offline mode
+- Updated the package dependencies used by `graph_widgets.py` to use `ipywidgets`
+- Updated `default-schema`
+
 ## [1.12.2] - 2016-06-20
 ### Updated
 - Updated plotly.min.js so the offline mode is using plotly.js v1.13.0

optional-requirements.txt

@@ -22,3 +22,9 @@ pandas
 
 ## scipy deps for some FigureFactory functions ##
 scipy
+
+## ipywidgets for IPython widgets ##
+ipywidgets
+
+## traitlets also used with IPython Widgets ##
+traitlets