Add new version to CHANGELOG and update internal version.

Thank you @jaym, @slp, @yasushi-saito, @acshekhara1, @benc153,
@yuval-k, @functionary, @psanford @giuscri, @jsoref, @Carpetsmoker,
@PatrickSchuster, @aarzilli, @derekparker, @ramya-rao-a and @dlsniper.