Update change log for newCAS prod release 21.2.1

cslzchen · cslzchen · commit 91feaf6340b2 · 2021-04-28T18:01:42.000-04:00
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -2,6 +2,11 @@
 
 We follow the CalVer (https://calver.org/) versioning scheme: YY.MINOR.MICRO.
 
+21.2.1 (04-28-2021)
+===================
+
+Fix root controller relative redirection
+
 21.2.0 (04-28-2021)
 ===================
 
