add colorio (with logo)

Author: nschloe

_sections/30-projects.md

@@ -81,6 +81,7 @@ These projects pledge to drop Python 2 support in or before 2020.
 - [![](https://urduhack.readthedocs.io/en/stable/_static/urduhack.png)Urduhack](https://github.com/urduhack/urduhack) <!-- url:https://github.com/urduhack/urduhack sg:122 -->
 - [![](assets/osbrain.png)osBrain](https://github.com/opensistemas-hub/osbrain) <!-- url:https://github.com/opensistemas-hub/osbrain sg:117 -->
 - [![](assets/fenics.png)FEniCS](https://fenicsproject.org/)  <!-- url:https://github.com/FEniCS/dolfin sg:77 -->
+- [![](assets/colorio.png)colorio](https://github.com/nschloe/colorio)
 - [![](assets/tatsu.png)TatSu](https://tatsu.readthedocs.io/)
 - [![](assets/chaquopy.png)Chaquopy](https://chaquo.com/chaquopy/)
 - [![](assets/angr.png)angr](http://angr.io/)