fix: use 3.3 as suggested by travis

patrickleet · web-flow · commit 942e420183dc · 2018-12-23T13:37:14.000-05:00
diff --git a/docker-compose.yml b/docker-compose.yml
@@ -1,8 +1,8 @@
-version: '3.5'
+version: '3.3'
 
 services:
 
   mongo:
     image: mongo
     ports:
-      - 27017:27017
+      - 27017:27017
