Add matplotlib to curriculum (#864)

Author: meevans1

_training/curriculum.md

@@ -110,6 +110,7 @@ The curriculum is comprised of a set of standardized *modules*, so that students
 | ``uproot`` | Reading and writing ROOT files without having to install ROOT. | <span class="beta">β</span> | [authors](https://github.com/hsf-training/hsf-training-uproot-webpage/blob/gh-pages/AUTHORS) | <a class="glyphicon glyphicon-wrench" href="https://github.com/hsf-training/hsf-training-uproot-webpage"></a>  | <a class="glyphicon glyphicon-book" href="https://hsf-training.github.io/hsf-training-uproot-webpage/"></a> |
 | A simple analysis | A simple analysis using CMS open data| <span class="stable">✔</span> | [authors](https://github.com/hsf-training/hsf-training-cms-analysis-webpage/blob/gh-pages/AUTHORS) | <a class="glyphicon glyphicon-wrench" href="https://github.com/hsf-training/hsf-training-cms-analysis-webpage"></a> | <a class="glyphicon glyphicon-book" href="https://hsf-training.github.io/hsf-training-cms-analysis-webpage/"></a>  &nbsp; <a class="glyphicon glyphicon-film" href="https://www.youtube.com/watch?v=gplMywJAFDI&list=PLKZ9c4ONm-Vk0wnDKaaovoEkOk3PVdL0V"></a> |
 | Unit testing                                | [Unit testing](https://en.wikipedia.org/wiki/Unit_testing) in python | <span class="beta">β</span> | [authors](https://github.com/carpentries-incubator/python-testing/blob/gh-pages/AUTHORS) | <a class="glyphicon glyphicon-wrench" href="https://github.com/carpentries-incubator/python-testing"></a> | <a class="glyphicon glyphicon-book" href="http://carpentries-incubator.github.io/python-testing/"></a> |
+| Matplotlib for HEP | | <span class="alpha">α</span> | [authors](https://github.com/hsf-training/hsf-training-matplotlib/blob/gh-pages/AUTHORS) | <a class="glyphicon glyphicon-wrench" href="https://github.com/hsf-training/hsf-training-matplotlib"></a> | <a class="glyphicon glyphicon-book" href="https://hsf-training.github.io/hsf-training-matplotlib/"></a> |
 
 ### Intermediate