Update docker-compose.yml

Author: l4rm4nd

examples/watchtower/docker-compose.yml

@@ -25,7 +25,7 @@ services:
       - /etc/localtime:/etc/localtime:ro
     working_dir: /
     labels:
-      com.centurylinklabs.watchtower: true
+      - com.centurylinklabs.watchtower.enable=true
 
   socket-proxy:
     image: lscr.io/linuxserver/socket-proxy:latest