Fix CI

Author: eldadfux

.travis.yml

@@ -1,3 +1,10 @@
+dist: xenial
+
+arch:
+  - amd64
+
+os: linux
+
 language: php
 
 php:
@@ -7,6 +14,9 @@ notifications:
   email:
     - [email protected]
 
+services:
+  - docker
+
 before_install:
   - curl -fsSL https://get.docker.com | sh
   - echo '{"experimental":"enabled"}' | sudo tee /etc/docker/daemon.json
@@ -18,7 +28,6 @@ before_install:
       echo "${DOCKERHUB_PULL_PASSWORD}" | docker login --username "${DOCKERHUB_PULL_USERNAME}" --password-stdin
     fi
 
-
 install:
   - docker --version
   - composer install