fix PermissionAndroid API link

Author: ckaznable

README.md

@@ -165,7 +165,7 @@ If you are going to use the `wifiOnly` flag, you need to add this to `AndroidMan
 
 **Grant Access Permission for Android 6.0**
 
-Beginning in Android 6.0 (API level 23), users grant permissions to apps while the app is running, not when they install the app. So adding permissions in `AndroidManifest.xml` won't work for Android 6.0+ devices. To grant permissions in runtime, you might use [PermissionAndroid API](https://facebook.github.io/react-native/docs/permissionsandroid.html).
+Beginning in Android 6.0 (API level 23), users grant permissions to apps while the app is running, not when they install the app. So adding permissions in `AndroidManifest.xml` won't work for Android 6.0+ devices. To grant permissions in runtime, you might use [PermissionAndroid API](https://facebook.github.io/react-native/docs/permissionsandroid).
 
 ## Usage