Fix change log formatting

Author: homebysix

CHANGELOG.md

@@ -8,7 +8,7 @@ All notable changes to this project will be documented in this file. This projec
 ### Added
 - Added check for unexpected processor arguments in CodeSignatureVerifier.
 
-## Changed
+### Changed
 - Renamed default branch to `main`.
 
 ## [1.8.1] - 2020-12-08