Added Release date

Added Release date
Signed off by: Saju <sajmoham@redhat.com>

Author: msaju

docs/release-notes/8.3.md

@@ -1,5 +1,7 @@
 # Release notes for Gluster 8.3
 
+**Release date:** 23-Dec-2020
+
 This is a bugfix release. The release notes for [8.0](8.0.md), [8.1](8.1.md) and [8.2](8.2.md)
 contain a listing of all the new features that were added
 and bugs fixed in the GlusterFS 8 stable release.