added installation of docker-compose

roles/docker/tasks/main.yml

@@ -19,4 +19,9 @@
 - name: docker | install docker | cleanup
   file:
     path: "/tmp/get-docker.sh" # required. Path to the file being managed.
-    state: absent
+    state: absent
+
+- name: docker | install docker-compose
+  package:
+    name: docker-compose
+    state: latest