CORD-867 update docker-compose version

Change-Id: Icc455c8a370076788807310e7d3a61b2c71305b5
diff --git a/roles/docker/tasks/main.yml b/roles/docker/tasks/main.yml
index a0383a2..7b6f2e6 100644
--- a/roles/docker/tasks/main.yml
+++ b/roles/docker/tasks/main.yml
@@ -50,8 +50,9 @@
 - name: Docker Compose
   become: yes
   get_url:
-    url=https://github.com/docker/compose/releases/download/1.7.1/docker-compose-Linux-x86_64
-    dest=/usr/local/bin/docker-compose
-    owner=root
-    group=root
-    mode="0755"
+    url: https://github.com/docker/compose/releases/download/1.7.1/docker-compose-Linux-x86_64
+    checksum: "sha256:3166bb74bc648e68c3154bc704fddf6bccf59f03a0c90fc48aefac034535e4ae"
+    dest: /usr/local/bin/docker-compose
+    owner: root
+    group: root
+    mode: "0755"