Check equality properly

roles/matrix-base/tasks/sanity_check.yml

@@ -12,7 +12,7 @@
     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_distribution == 'Ubuntu'
-    - "ansible_version.major = 2 and ansible_version.major == 9 and ansible_version.minor = 6"
+    - "ansible_version.major == 2 and ansible_version.major == 9 and ansible_version.minor == 6"
 
 - name: (Deprecation) Catch and report renamed settings
   fail: