changelog not so useful when PRs are reverted #23

See:

https://github.com/strongloop/strong-pm/blob/master/CHANGES.md#2015-01-21-version-160

You can see the PR number that was reverted, but unless you go rummaging around on github (there is no link to follow), you can't see which of the commits got reverted.

If the commits each had pre-pended (hyperlinked or not) PR number, it would be clear (cf. #21)

Maybe it would also be possible to get a changelog not showing the reverted commits if they were reverted within a single changelog segment, though that sounds hard.