Fix the compose file as of @buchdag help (nginx-proxy/acme-companion#226 (comment))

Author: evertramos

docker-compose.yml

@@ -40,6 +40,7 @@ services:
       - /var/run/docker.sock:/var/run/docker.sock:ro
     environment:
       NGINX_DOCKER_GEN_CONTAINER: "nginx-gen"
+      NGINX_PROXY_CONTAINER: "nginx"
 
 networks:
   default: