Use pip to install docker-compose

Change-Id: I78aeb7f1f2af616211804c792b7200a31bfaee60
diff --git a/ansible/roles/docker-compose/tasks/main.yml b/ansible/roles/docker-compose/tasks/main.yml
index 6f16cfa..e3164b1 100644
--- a/ansible/roles/docker-compose/tasks/main.yml
+++ b/ansible/roles/docker-compose/tasks/main.yml
@@ -1,6 +1,6 @@
-- name: Executable is present
-  get_url:
-    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
-    mode: 0755
+- name: docker-compose is present
+  become: yes
+  pip:
+    name: docker-compose
+    version: 1.9
+    state: present