correctly parse deploy hook for commit

Author: bradrydzewski

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 - Fix issue with GitHub enterprise deep link including API prefix, from [@bradrydzewski](https://github.com/bradrydzewski).
+- Fix issue with GitHub deploy hooks for commits having an invalid reference, from [@bradrydzewski](https://github.com/bradrydzewski).
 
 ## [1.6.0]
 ### Added