CHANGELOG.md in semmy-0.3.0 vs CHANGELOG.md in semmy-0.4.0

@@ -1,6 +1,16 @@
 # CHANGELOG
 
+### Version 0.4.0
+
[phone]
+
+[Compare changes](https://github.com/tf/semmy/compare/0-3-stable...v0.4.0)
+
+- Only keep sections for current minor version in changelog and link
+  to previous stable branch.
+- Compare minor versions to previous stable branch.
+
 ### Version 0.3.0
 
 2016-09-09
 
 [Compare changes](https://github.com/tf/semmy/compare/v0.2.0...v0.3.0)