Typing fixes, make mypy happy · GispoCoding/arho-feature-template@261e550

"pull_request_target.opened" is not a known webhook name (https://developer.github.com/v3/activity/events/types/)

"pull_request_target.reopened" is not a known webhook name (https://developer.github.com/v3/activity/events/types/)

"pull_request_target.synchronize" is not a known webhook name (https://developer.github.com/v3/activity/events/types/)

"pull_request_target.edited" is not a known webhook name (https://developer.github.com/v3/activity/events/types/)

Provide feedback