Release jira for the 4.3.6 release

[Brian Leathem]

Hello all,

I've created the release jira for the 4.3.6 release [1] and updated the
release notes in the master branch.

@Michal please proceed with staging the release, be sure to let me know
if you hit any stumbling blocks.

[1] https://issues.jboss.org/browse/RFPL-3283

Brian