add pr:reviewer:approved as a valid event for Bitbucket Server#198

brentvvosselen wants to merge 1 commit intobitrise-io:masterbitrise-io/bitrise-webhooks:masterfrom

brentvvosselen:introduce-pr-approved-bb-serverbrentvvosselen/bitrise-webhooks:introduce-pr-approved-bb-serverCopy head branch name to clipboard