Update changelog

Document changes for 0.3.

Author: dmlap

README.md

@@ -192,6 +192,10 @@ Inside you'll find the minified ads plugin file `videojs-ads.min.js`.
 
 A short list of features, fixes and changes for each release.
 
+### v0.3.0
+
+ * Post-roll support
+
 ### v0.2.0
 
  * Upgrade to video.js 4.4.3