Update .travis.yml

Author: nikriek

.travis.yml

@@ -1,8 +1,22 @@
+sudo: required
+
 language: node_js
 node_js:
   - "6"
+
 services:
   - mongodb
+  - docker
+
+env:
+  DOCKER_COMPOSE_VERSION: 1.6.0
+
+before_install:
+  - sudo rm /usr/local/bin/docker-compose
+  - curl -L https://github.com/docker/compose/releases/download/${DOCKER_COMPOSE_VERSION}/docker-compose-`uname -s`-`uname -m` > docker-compose
+  - chmod +x docker-compose
+  - sudo mv docker-compose /usr/local/bin
+  
 after_success:
   - if [ "$TRAVIS_BRANCH" == "master" ]; then
     docker build -t nikriek/projectsecure-client:latest --build-arg API_URL=$API_URL . ;