Update README.md

Author: AlexEMG

README.md

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 In **2020** we will host 2 workshops and 2 hackathons, one each at Harvard  and one each at EPFL. See [here for details](http://www.mousemotorlab.org/workshops). We will also be present at various other summer schools (TBA).
 
-**NEW: due to COVID-19, we are working on a virtual [self-paced spring/summer course](summercourse_2020.md)**
+**NEW: due to COVID-19, we are working on a virtual [self-paced spring/summer course](summer_course2020.md)**
 
 
 # DeepLabCut 2020 Workshop Materials: