Updated the latest review date for the abbreviated list of release note in the README file

Signed-off-by: Yixin Zhang <zhany217@wfu.edu>
2020-04-03 10:58:23 -04:00 · 2020-04-03 10:58:23 -04:00 · c497f79812
--- a/2
+++ b/2
@ -118,7 +118,7 @@ The rest of this README file contains:
 ===========================================================================

 The following abbreviated list of release notes applies to this code
-base as of this writing (March 2019):
+base as of this writing (April 2020):

 General notes
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