Update README.md

Author: Alex Page

README.md

@@ -112,7 +112,7 @@ You may need to enable policy settings to allow running workflows from forks. Pl
 
 ## Release History
 
-- v0.8.0 - Add new action type 'add'
+- v0.8.0 - Add new action type `add`
 - v0.7.1 - Move Node.js version back to v12
 - v0.7.0 - Update documentation and dependencies
 - v0.6.0 - Add support for `pull_request_target` and `pull_request_review`