fix yml

examples/nginx-proxy-manager-goaccess/docker-compose.yml

@@ -1,4 +1,7 @@
-goaccess:
+version: "3"
+
+services:
+  goaccess:
     image: xavierh/goaccess-for-nginxproxymanager:latest
     container_name: goaccess
     restart: always
@@ -11,4 +14,4 @@ goaccess:
         - SKIP_ARCHIVED_LOGS=False #optional
         - BASIC_AUTH=False #optional
         - BASIC_AUTH_USERNAME=user #optional
-        - BASIC_AUTH_PASSWORD=pass #optional
+        - BASIC_AUTH_PASSWORD=pass #optional