ec2_vpc_dhcp_options_facts.py no py3

Old PR was merged that hadn't been updated since we added the py3 checks

lib/ansible/modules/extras/.travis.yml

@@ -29,6 +29,7 @@ env:
       cloud/amazon/ec2_vpc_route_table.py
       cloud/amazon/ec2_vpc_subnet_facts.py
       cloud/amazon/ec2_vpc_subnet.py
+      cloud/amazon/ec2_vpc_dhcp_options_facts.py
       cloud/amazon/ecs_cluster.py
       cloud/amazon/ecs_service_facts.py
       cloud/amazon/ecs_service.py