Print docker-compose version

.travis.yml

@@ -12,7 +12,7 @@ before_install:
   - 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
-  - docker-compose -version
+  - docker-compose --version
   # Needed to deploy pull request and releases
   - sudo apt-get -y install python-pip python-dev
   - pip install awscli --upgrade --user
@@ -22,6 +22,7 @@ before_script:
   - git clone https://github.com/gnosis/safe-transaction-history.git
   - cd safe-transaction-history
   - git checkout develop
+  - docker-compose --version
   - docker-compose build
   - docker-compose up -d
   - cd ..