Add release notes for 1.13.0

Change-Id: Iac2a0ae740c3dabc5e7d8b7ef53312924c6e3532
Reviewed-on: http://gerrit.cloudera.org:8080/16410
Tested-by: Kudu Jenkins
Reviewed-by: Greg Solovyev <gsolovyev@cloudera.com>
Reviewed-by: Alexey Serbin <aserbin@cloudera.com>
Reviewed-by: Grant Henke <granthenke@apache.org>
1 file changed