- Added Unison for syncing.

playbook.yml

 ---
 - hosts: all
   pre_tasks:
-      - name: APT install Python3, Tox, Cron
+      - name: APT install Python3, Tox, Cron, Unison
         apt:
             name:
                 - python3
                 - tox
                 - cron-daemon
+                - unison
             state: present
             update_cache: True
             cache_valid_time: 3600