update README.md

README.md

@@ -80,6 +80,7 @@ Maybe this should be changed in the future to be separate but we'll leave that
 discussion for the future.
 
 Added in Spring 2019:
+
 Entity descriptions for algebra in lisp form. There are two sorts of operators:
 (1) operators producing normal tables with an ordered finite sequence of attribute
 names, and (2) operators producing “column tables”, where tuples are a possibly