Updated contributing doc to have Python 3.6 instead of 3.5 (#3306)
Updated contributing doc to have Python 3.6 instead of 3.5 (#3306)

* Updated contributing doc to have Python 3.6 instead of 3.5
rackerlabs/django-DefectDojo,rackerlabs/django-DefectDojo,rackerlabs/django-DefectDojo,rackerlabs/django-DefectDojo