CHANGELOG.md in dxopal-1.2.0 vs CHANGELOG.md in dxopal-1.3.0

@@ -1,4 +1,9 @@
+## v1.3.0 (2018-09-29)
+
+- new: [Support blend mode `:add`](https://github.com/yhara/dxopal/pull/11)
+- Update gems 
+
 ## v1.2.0 (2018-05-16)
 
 - new: Support shift/ctrl key 
 - new: Added some opal stdlibs
   - singleton