bump version to 0.5.3 (#2306)

api/controllers/web/app.py

@@ -1,15 +1,14 @@
 # -*- coding:utf-8 -*-
+import json
+
 from controllers.web import api
 from controllers.web.wraps import WebApiResource
+from extensions.ext_database import db
 from flask import current_app
 from flask_restful import fields, marshal_with
 from models.model import App, AppModelConfig
 from models.tools import ApiToolProvider
 
-from extensions.ext_database import db
-
-import json
-
 
 class AppParameterApi(WebApiResource):
     """Resource for app variables."""