Exact Match Labels

Merge pull request #26 from Zegocover/fix-label-match-criteria

add exact match
Remove label: bug

Rebuild files

Merge pull request #25 from Zegocover/Update-error-msg

build of branch

Find label by Labeled event

Fix for an issue with response for pull request data occurs sometimes where the response to this actions request for pull request labels data is empty (i.e. no labels on PR) even when this action adds the labels. This only occurs if we manually remove a label such that no labels exist on pull request.

Solution: If the pull request does not have labels look for the labeled event created by this action for labels.

Validate Label once added

Label validation to ensure only 1 label of the specified labels has been added to PR