pin docker compose version

Author: wurstmeister

.travis.yml

@@ -9,6 +9,13 @@ services:
 env:
   global:
     - LATEST="2.12-2.3.0"
+    - DOCKER_COMPOSE_VERSION=1.23.2
+
+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
 
 # Build recommended versions based on: http://kafka.apache.org/downloads
 matrix: