fix docker configuration

docker-compose.yml

@@ -1,4 +1,4 @@
-version: '3.7'
+version: '3'
 
 services:
   app:
@@ -39,7 +39,7 @@ services:
     image: nginx:1.17-alpine
     restart: unless-stopped
     ports:
-      - 8080:80
+      - 80:80
     volumes:
       - ./:/var/www
       - ./docker-compose/nginx:/etc/nginx/conf.d/