fix bug

data/1.python初阶/3.进阶语法/4.with-as/withas.md

@@ -93,5 +93,5 @@ def load_json(file):
 
 def dump_json(file, obj):
     with open(file, 'w') as f:
-        f.write(json.dumps(obj, ensure_ascii=False, indent=2))
+        f.write(json.dumps(obj, 2, False))
 ```