Add 0.9.1 to ChangeLog

[msabramo]

I noticed that 0.9.1 was released on 2013-05-23, but I didn't see any entries in the ChangeLog at http://validictory.readthedocs.org/en/latest/changelog.html

though I do see entries at: https://github.com/sunlightlabs/validictory/blob/e653bfbf3a0bacfb51e8976cfc3c5f7b974a2977/docs/changelog.rst

So perhaps ReadTheDocs just needs to be pinged and told to rebuild the docs?

[jamesturk]

thanks, i'll take a look

[jamesturk]

fixed