[FEATURE] Update to new docker version

you need to update all docker-compose files of your project!

docker-compose.yml

@@ -17,6 +17,8 @@ services:
       - ./nginx-prod-settings.conf:/etc/nginx/conf.d/nginx-prod-settings.conf
     labels:
       - "com.github.jrcs.letsencrypt_nginx_proxy_companion.nginx_proxy=true"
+    networks:
+      - nginx-proxy
 
   dockergen:
     image: jwilder/docker-gen:0.7.3
@@ -32,6 +34,8 @@ services:
       - certs:/etc/nginx/certs
       - /var/run/docker.sock:/tmp/docker.sock:ro
       - ./nginx.tmpl:/etc/docker-gen/templates/nginx.tmpl:ro
+    networks:
+      - nginx-proxy
 
   letsencrypt:
     image: jrcs/letsencrypt-nginx-proxy-companion
@@ -49,6 +53,8 @@ services:
       - html:/usr/share/nginx/html
       - certs:/etc/nginx/certs
       - /var/run/docker.sock:/var/run/docker.sock:ro
+    networks:
+      - nginx-proxy
 
 volumes:
   conf:
@@ -56,8 +62,7 @@ volumes:
   html:
   certs:
 
-
 networks:
-  default:
-    external:
-      name: nginx-proxy
+  nginx-proxy:
+    external: true
+