Fix changelog headline

Author: omab

CHANGELOG.md

@@ -26,6 +26,6 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [0.0.1](https://github.com/python-social-auth/social-app-django/releases/tag/0.0.1) - 2016-11-27
 
-### Chaged
+### Changed
 - Split from the monolitic [python-social-auth](https://github.com/omab/python-social-auth)
   codebase