Bump cython from 0.29.9 to 0.29.10 (#101)

Bumps [cython](https://github.com/cython/cython) from 0.29.9 to 0.29.10.
- [Release notes](https://github.com/cython/cython/releases)
- [Changelog](https://github.com/cython/cython/blob/master/CHANGES.rst)
- [Commits](https://github.com/cython/cython/compare/0.29.9...0.29.10)

requirements.dev.txt

 flake8==3.7.7
-Cython==0.29.9
+Cython==0.29.10
 nose==1.3.7
 pylint==1.9.4
 pytest==4.5.0