Revert back to MongoDB v3.2.15 because v3.2.16 is not yet available on Docker Hub.

docker-compose.yml

@@ -3,7 +3,7 @@ version: '2'
 services:
 
   wekandb:
-    image: mongo:3.2.16
+    image: mongo:3.2.15
     container_name: wekan-db
     restart: always
     command: mongod --smallfiles --oplogSize 128