Updated openstack/openstack
Project: openstack/heat  6a3137de22a6b79a112c18a895d8524614c4c324

Remove Python 2.6 classifier

Heat does not support Python 2.6 anymore starting with Kilo and might
not work correctly with it, so remove the classifier.

Change-Id: Ie8239823b448cc95fdcce3afe27523cb960863d6