[Cython] Cython 0.23 beta 2 released

[Robert Bradshaw]

On Wed, Aug 5, 2015 at 10:25 AM, Jeroen Demeyer <jdemeyer at cage.ugent.be> wrote:
> As I already mentioned, I still think that the changelog should mention
> something about the changes to "enum". There were 2 threads on the mailing
> list about problems due to this change (code which abused enum no longer
> compiled), so it would be nice to say something about this.

Done.

I also created a new 0.23.x release branch so that development can
continue on master without impacting the release.

FYI, the beta looks good to go for me.

- Robert