Fixes #2: Allow for Docker Compose version upgrades.

tasks/docker-compose.yml

@@ -0,0 +1,18 @@
+---
+- name: Check current docker-compose version.
+  command: docker-compose --version
+  register: docker_compose_current_version
+  changed_when: false
+  failed_when: false
+
+- name: Delete existing docker-compose version if it's different.
+  file:
+    path: /usr/local/bin/docker-compose
+    state: absent
+  when: docker_compose_version not in docker_compose_current_version.stdout
+
+- name: Install Docker Compose (if configured).
+  get_url:
+    url: https://github.com/docker/compose/releases/download/{{ docker_compose_version }}/docker-compose-Linux-x86_64
+    dest: /usr/local/bin/docker-compose
+    mode: 0755

tasks/main.yml

@@ -14,9 +14,5 @@
     state: started
     enabled: yes
 
-- name: Install Docker Compose (if configured).
-  get_url:
-    url: https://github.com/docker/compose/releases/download/{{ docker_compose_version }}/docker-compose-Linux-x86_64
-    dest: /usr/local/bin/docker-compose
-    mode: 0755
+- include: docker-compose.yml
   when: docker_install_compose