fix android view bug on Android P (readme)

README-ZH.md

 当一个Unity项目运行在Android设备上时，状态栏是默认隐藏且无法在编辑内进行调整的。
 如果您希望在您的UIWidgets App中显示状态栏，您可以使用这个[解决方案](https://github.com/Over17/UnityShowAndroidStatusBar)。我们将尽快推出我们自己的解决方案，并保证届时开发者可以进行无缝切换。
 
+此外，为了让上述插件在Android P及以上Android系统中正常工作，请勾选上"Player Settings"中的"Render Outside Safe Area"选项。
+
 #### 七、自动调节帧率
 如果要使得构建出的应用能够自动调节帧率，请打开Project Settings，将构建目标平台对应的Quality选项卡中的V Sync Count设置为Don't Sync。
 默认的逻辑是在界面静止时将帧率降低为25，在界面变动时将帧率提高至60。

README.md

  want to show the status bar in your App, this
  [solution](https://github.com/Over17/UnityShowAndroidStatusBar) seems to be 
  compatible to UIWidgets, therefore can be used as a good option before we release our
- full support solution on this issue.
+ full support solution on this issue. 
+ 
+ Besides,
+ please set "Render Outside Safe Area" to true in the "Player Settings" to make this plugin working properly on Android P or later.
+ 
+ 
+
 
 #### Automatically Adjust Frame Rate