Update CHANGELOG.md

Author: msanders

CHANGELOG.md

@@ -7,12 +7,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## 0.5.0 - 2020-08-18
 
-### Changed
+### Breaking Changes
 
 - Greedy cask update feature is now guarded behind the `--all` flag (e.g. `zero
   update --all` or `zero setup --all`).
 
-  
 ### Fixed
 
 - Addressed issue applying system updates on latest SDK.