Todo: Skip the wait check for specific PRs

Hey!

Related to #89 , and as seen in [#92(comment)](https://github.com/joyeecheung/node-core-utils/pull/92#issuecomment-342593313):
* [ ] check for labels `doc` and `test`
* [ ] check for a max number of files

Question: what is the ideal number of files? I would go for three, but I'm not an expert...