update the requirement.txt to ansible 2.x

playbooks/roles/launch_ec2/tasks/main.yml

@@ -49,7 +49,7 @@
     group: "{{ security_group }}"
     instance_type: "{{ instance_type }}"
     image: "{{ ami }}"
-    vpc_subnet_id: "{{ vpc_subnet_id }}"
+    vpc_subnet_id: "subnet-cd867aba" #"{{ vpc_subnet_id }}"
     assign_public_ip: yes
     wait: True
     region: "{{ region }}"