Update docker-compose.yml

Remove the version: because it is obsolete. See: https://docs.docker.com/compose/compose-file/04-version-and-name/#version-top-level-element-optional

Author: michaelortnerit

docker-compose.yml

@@ -1,8 +1,6 @@
 # This is a Docker Compose configuration
 # intended for development purposes only
 
-version: '3'
-
 volumes:
   db: {}