Merge pull request #184 from scoder/patch-1

Add Cython project

Author: mscuthbert

_sections/30-projects.md

@@ -27,6 +27,7 @@ These projects pledge to drop Python 2 support in or before 2020.
 - [![](assets/spyder.png)Spyder](https://www.spyder-ide.org)
 - [![](assets/scikit-image.png)Scikit Image](http://scikit-image.org/)
 - [![](assets/pymc3.png)PyMC3](https://github.com/pymc-devs/pymc3)
+- [![](https://cython.org/logo/cython-logo-C.svg)Cython](https://cython.org/)
 - [![](assets/tensorpack.png)Tensorpack](https://github.com/tensorpack/tensorpack)
 - [![](assets/pytest1.png)pytest](https://docs.pytest.org/en/latest)
 - [![](assets/hypothesis.svg)Hypothesis](https://hypothesis.readthedocs.io/)