add icon for PySCIPOpt

Author: mattmilten

_sections/30-projects.md

@@ -54,6 +54,7 @@ These projects pledge to drop Python 2 support in or before 2020.
 -[![](assets/metpy.png)MetPy](https://unidata.github.io/MetPy)
 -[![](assets/pylast.png)pyLast](https://github.com/pylast/pylast)
 -[![](assets/psi4square.png)Psi4](http://psicode.org/)
+-[![](assets/pyscipopt.png)PySCIPOpt](https://github.com/SCIP-Interfaces/PySCIPOpt)
 -[![](assets/openquake.png)OpenQuake engine](https://github.com/gem/oq-engine)
 -[![](assets/yt.png)yt](https://yt-project.org/)
 -[![](assets/cmd2.png)cmd2](https://github.com/python-cmd2/cmd2)
@@ -81,7 +82,6 @@ for some that aren't directly comparable. -->
 -[An Introduction to Applied Bioinformatics](http://readiab.org)
 -[pvlib-python](https://github.com/pvlib/pvlib-python)
 -[QIIME](http://qiime.org)
--[PySCIPOpt](https://github.com/SCIP-Interfaces/PySCIPOpt)
 -[SPADE](https://github.com/javipalanca/spade)
 -[gala](https://gala.readthedocs.io)
 -[CIS](https://github.com/cedadev/cis)