Changelog

This adds a little overhead to your workflow, @antirez, but is trivial and, in my eyes, very important to have.

Currently, when I see that version number change on http://lamernews.com, I have no way to know what has changed, aside from exploring and checkout out the commits. That's OK, but not very quick or straightforward, especially for the potential non-programmer user.

_Update_: Please! :D