Actually enforce that we run on Ansible >= 2.7.1

Related to 6e652e10ad

roles/matrix-base/tasks/sanity_check.yml

@@ -1,10 +1,11 @@
 ---
 
-# We generally support Ansible 2.7.0 and above.
-- name: Fail if running on Ansible < 2.7
+# We generally support Ansible 2.7.1 and above.
+- name: Fail if running on Ansible < 2.7.1
   fail:
     msg: "You are running on Ansible {{ ansible_version.string }}, which is not supported. See our guide about Ansible: https://github.com/spantaleev/matrix-docker-ansible-deploy/blob/master/docs/ansible.md"
-  when: "(ansible_version.major < 2) or (ansible_version.major <= 2 and ansible_version.minor < 7)"
+  when:
+    - "(ansible_version.major < 2) or (ansible_version.major == 2 and ansible_version.minor < 7) or (ansible_version.major == 2 and ansible_version.minor == 7 and ansible_version.revision < 1)"
 
 # Though we do not support Ansible 2.9.6 which is buggy
 - name: Fail if running on Ansible 2.9.6 on Ubuntu