Update changelog

Author: witcher112

CHANGELOG.md

@@ -21,6 +21,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Cancelling update (#1222)
 - Displaying transparent banner images (#1249)
 - Patcher would always uninstall an old version of the game for repairs, event if it wasn't broken (#1273)
+- Patcher freeze after uninstalling app (#1276)
 
 ## [3.13.0]
 ### Added