docs(contributing): add recent semantic-release formula

Author: myii

docs/CONTRIBUTING.rst

@@ -168,6 +168,7 @@ These formulas are already compatible with semantic-release:
 * `cert-formula <https://github.com/saltstack-formulas/cert-formula>`_
 * `chrony-formula <https://github.com/saltstack-formulas/chrony-formula>`_
 * `collectd-formula <https://github.com/saltstack-formulas/collectd-formula>`_
+* `deepsea-formula <https://github.com/saltstack-formulas/deepsea-formula>`_
 * `fail2ban-formula <https://github.com/saltstack-formulas/fail2ban-formula>`_
 * `golang-formula <https://github.com/saltstack-formulas/golang-formula>`_
 * `grafana-formula <https://github.com/saltstack-formulas/grafana-formula>`_