fix up

.travis.yml

@@ -7,8 +7,10 @@ before_install:
   - curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
   - sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
   - sudo apt-get update
-  - sudo apt-get -y install docker-ce  docker-compose # update docker version
+  - sudo apt-get -y install docker-ce  # update docker version
+  - sudo curl -L https://github.com/docker/compose/releases/download/1.21.2/docker-compose-$(uname -s)-$(uname -m) -o /usr/local/bin/docker-compose
   - docker -v
+  - whereis docker-compose
   - docker-compose -v
   - docker-compose up -d
   - sleep 5                     # wait all components get ready