Add links to 2020 and 2021 workshops on Other Media page

Author: rbuch

content/othermedia.html

@@ -10,6 +10,8 @@
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 <h3>Charm++ Workshops:</h3>
 <font size="+1">
+<li><a href="http://charm.cs.illinois.edu/workshops/charmWorkshop2021/">19th Workshop 2021</a></li>
+<li><a href="http://charm.cs.illinois.edu/workshops/charmWorkshop2020/">18th Workshop 2020</a></li>
 <li><a href="http://charm.cs.illinois.edu/workshops/charmWorkshop2019/">17th Workshop 2019</a></li>
 <li><a href="http://charm.cs.illinois.edu/workshops/charmWorkshop2018/">16th Workshop 2018</a></li>
 <li><a href="http://charm.cs.illinois.edu/workshops/charmWorkshop2017/">15th Workshop 2017</a></li>