Update README.md

CoderMJLee · Dec 9, 2019 · 0978736 · 0978736
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@@ -84,6 +84,8 @@ NSObject+MJKeyValue.h   NSObject+MJKeyValue.m
 
 # <a id="Examples"></a> Examples【示例】
 
+## Add `MJKeyValue` protocol to your model if needed【如果有需要, 请在模型中加入 `MJKeyValue` 协议】
+
 ### <a id="JSON_Model"></a> The most simple JSON -> Model【最简单的字典转模型】
 
 ```objc