hardcover-pessimist

Results 2 issues of hardcover-pessimist

This relates to #28 but does not resolve it. I did this for only the list of pull request output as a proof of concept for the approach. Feedback is...

I'd like to be able to add comments to a pull request. [upstream](https://github.com/ktrysmt/go-bitbucket/blob/master/pullrequests.go#L139) supports it.