Try to fix Travis.

.travis.yml

@@ -2,7 +2,7 @@ dist: rolling
 sudo: required
 
 env:
-  TRAVIS_DOCKER_COMPOSE_VERSION: 3.7
+  TRAVIS_DOCKER_COMPOSE_VERSION: 1.24.0
   TRAVIS_NODE_VERSION: 12.13.1
   TRAVIS_NPM_VERSION: latest
 

docker-compose.yml

@@ -1,4 +1,4 @@
-version: '3.7'
+version: '2'
 
 # Note: Do not add single quotes '' to variables. Having spaces still works without quotes where required.
 #---------------------------------------------------------------------------------------------------------