Merge pull request #2771 from scragraham/issue-2766

Release notes update for 3.5.2

Author: cdonati

RELEASE

@@ -5,6 +5,14 @@
 /_/  |_/ .___/ .___//____/\___/\__,_/_/ \___/
       /_/   /_/
 
+AppScale version 3.5.2, released May 2018
+Highlights of features/bugs in this release:
+
+ - Issue-2770 - Groups are not locked during commit
+
+Known Issues:
+
+
 AppScale version 3.5.1, released April 2018
 Highlights of features/bugs in this release:
  - Upgrade to Cassandra 3.11.2