Update CHANGELOG.md

Author: Kully

CHANGELOG.md

@@ -2,6 +2,10 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## [1.12.8] - 2016-08-18
+### Fixed
+- Fixed color bug with trisurf plots where certain triangles were colored strangely. The coordinates of `rgb(...)` are now rounded to their nearest integer (using Python3 method of rounding), then placed in the color string to fix the issue.   
+
 ## [1.12.7] - 2016-08-17
 ### Fixed
 - Edited `plotly.min.js` due to issue using `iplot` to plot offline in Jupyter Notebooks