Update previous_hackathons.yml

Author: DCGenomics

_data/previous_hackathons.yml

@@ -1,3 +1,8 @@
+- date: "March 9-11, 2022"
+  loc: "Bringing Complex Genomic Data to the Clinic III -- Carnegie Mellon Libraries/JHU"
+  link: https://www.library.cmu.edu/about/news/2022-02/hackathon-2022
+  community access:  
+
 - date: "January 11-14, 2022"
   loc: "Worldwide Dementia Hackathon -- Stay Tuned"
   link: https://demondementia.com/neurohack2022/