[Cython] Cython 0.21 release candidate

[Stefan Behnel]

Hi all,

I uploaded a release candidate for 0.21. There were a couple of more
changes and cleanups since the last beta, so please give it another quick
round of testing.

http://www.cython.org/release/Cython-0.21rc1.tar.gz

http://www.cython.org/release/Cython-0.21rc1.tar.gz.asc

Complete changelog:

https://github.com/cython/cython/blob/8337b8aec2ecbb4480d551e12b1faf9b21ba2cb1/CHANGES.rst

Stefan