changelog: fix 0.3.2 release date

    $ git show 0.3.2
    commit d2d1285e26a206278ae9f711a589b5e49f54c60e
    Author: Jeremy Ashkenas <jashkenas@gmail.com>
    Date:   Thu Oct 29 14:45:56 2009 -0400

        version 0.3.2, with 'identity', and Rhino support

Currently, 0.3.2 appears to have been released *before* 0.3.1. ;)