Remove version from traefik.yml (#235)

https://docs.docker.com/reference/compose-file/version-and-name/#version-top-level-element-obsolete

Author: aminvakil

traefik.yml

@@ -1,4 +1,4 @@
-version: '3.7'
+---
 
 volumes:
   traefik: { driver: local }
@@ -24,4 +24,3 @@ services:
     volumes:
       - traefik:/letsencrypt:rw
       - /run/docker.sock:/var/run/docker.sock:ro
-