Updating to the latest docker-compose version

.travis.yml

@@ -8,6 +8,10 @@ node_js:
 os:
   - linux
 before_install:
+  - sudo rm /usr/local/bin/docker-compose
+  - curl -L https://github.com/docker/compose/releases/download/${DOCKER_COMPOSE_VERSION}/docker-compose-`uname -s`-`uname -m` > docker-compose
+  - chmod +x docker-compose
+  - sudo mv docker-compose /usr/local/bin
   # Needed to deploy pull request and releases
   - sudo apt-get -y install python-pip python-dev
   - pip install awscli --upgrade --user