add goal-tools repo to tc list

The goal-tools repository includes tools for use by goal
champions. Since goals are a TC-driven initiative, it makes sense to
mark the repository as owned by the TC.

Change-Id: If916d30b4e343cbb3b40d46af06edc684e83db2f
Signed-off-by: Doug Hellmann <doug@doughellmann.com>

reference/technical-committee-repos.yaml

@@ -8,3 +8,4 @@ Technical Committee:
   - repo: openstack/project-team-guide
   - repo: openstack/service-types-authority
   - repo: openstack/election
+  - repo: openstack/goal-tools