also fix missing anaconda link just after heading

Author: btovar

episodes/00-before-we-start.md

@@ -252,6 +252,7 @@ instead of using a subset of your real dataset, create a small (3 columns, 5 row
 
 [stack-overflow]: https://stackoverflow.com
 [anaconda-community]: https://www.anaconda.com/community
+[anaconda]: https://www.anaconda.com/download
 [spyder-ide]: https://www.spyder-ide.org
 [python-docs]: https://www.python.org/doc
 [pandas-docs]: https://pandas.pydata.org/pandas-docs/stable/