Install later version of docker

.travis.yml

@@ -1,6 +1,12 @@
 language: sh
 
+addons:
+  apt:
+    packages:
+      - docker-ce
+
 before_script:
+  - docker --version
   - docker login -u $DOCKER_LOGIN -p $DOCKER_PASSWORD $DOCKER_REGISTRY
   - sudo rm /usr/local/bin/docker-compose
   - curl -L https://github.com/docker/compose/releases/download/1.21.0/docker-compose-`uname -s`-`uname -m` > docker-compose