Updated openstack/openstack
Project: openstack/python-heatclient  eef7eb2b6cd06e6184bba99669c3e1efa42d70ea

Fix the section name in CONTRIBUTING.rst

The name of the section "If you're developer, start here"
has changed in the wiki, now is "If you're a developer".
This commit updates it to correctly refer to the
proper section.

Change-Id: Ifb6d65eade55cdb7fbe723e75d12a44b9dd954b4