add line in CHANGELOG

Author: H3r3zy

CHANGELOG.md

@@ -11,6 +11,7 @@ project adheres to [Semantic Versioning](http://semver.org/).
 ### Added
 ### Fixed
 * Fix `actualBoundingBoxLeft` and `actualBoundingBoxRight` when `textAlign='center'` or `'right'` ([#1909](https://github.com/Automattic/node-canvas/issues/1909))
+* Fix `rgba(r,g,b,0)` with alpha to 0 should parse as transparent, not opaque.
 
 2.10.0
 ==================