Update README.md

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 # Out-of-Core Group By Aggregate
 # Out-of-Core Group By Aggregate
 
 
-*Graduating Seniors: Due 6/5/20 11:59 PM*
-*Everyone else: Due 6/8/20 11:59 PM*
+*Due Friday May 21, 11:59 pm*
 
 
 In this assignment, you will implement an out-of-core
 In this assignment, you will implement an out-of-core
 version of the group by aggregate (aggregation by key)
 version of the group by aggregate (aggregation by key)