updating changelog

Author: swhitty

CHANGELOG.md

@@ -1,5 +1,12 @@
 # Change Log
 
+## [0.2](https://github.com/swhitty/SwiftDraw/releases/tag/0.2) (2017-06-12)
+
+- Adding `LayerTree` to enable optimizations and removal of redundant RenderCommands.
+- Adding `protocol Renderer`
+- Fixing element opacity errors
+- Fixing lineJoin parser errors
+
 ## [0.1](https://github.com/swhitty/SwiftDraw/releases/tag/0.1) (2017-05-24)
 
 - Initial Release. Hello World.