Update 9.0.md

Author: msaju

docs/release-notes/9.0.md

@@ -1,5 +1,7 @@
 # Release notes for Gluster 9.0
 
+**Release date:** 05-Feb-2021
+
 This is a major release that includes a range of features, code improvements and stability fixes as noted below.
 
 A selection of the key features and changes are documented in this page.
@@ -259,4 +261,4 @@ Bugs addressed since release-8 are listed below.
 - [#824](https://github.com/gluster/glusterfs/issues/824)  Migrate bugzilla workflow to github issues workflow
 - [#816](https://github.com/gluster/glusterfs/issues/816)  RFE: Data/MetaData separator Translator
 - [#790](https://github.com/gluster/glusterfs/issues/790)  infinite loop in common-utils.c - gf_rev_dns_lookup_cache() ?
-- [#763](https://github.com/gluster/glusterfs/issues/763)  thin-arbiter: Testing report
+- [#763](https://github.com/gluster/glusterfs/issues/763)  thin-arbiter: Testing report