Render milestone content as markdown
modify grammar undo -> undone
HookType is case-sensitive

Update webhook wasn’t showing up because of the wrong case
add organization-level webhooks
getOrgRepoCtx returns values directly & err
Merge pull request #447 from m0sth8/fix-milestone-render-markdown

Render milestone content as markdown
Merge pull request #442 from compressed/org_hook

Organization-level Webhooks
Organization level webhooks