docs(readme): onRegionChangeComplete called infinitely (react-native-maps#4574)

Author: Bilal-Abdeen

README.md

@@ -607,6 +607,25 @@ Source: https://github.com/react-native-maps/react-native-maps/issues/1901
 
 Source: https://github.com/react-native-maps/react-native-maps/issues/3957#issuecomment-924161121
 
+#### onRegionChangeComplete() callback is called infinitely
+
+If changing the state in `onRegionChangeComplete` is called infinitely, add a condition to limit these calls to occur only when the region change was done as a result of a user's action.
+
+```javascript
+onRegionChangeComplete={ (region, gesture) => {
+	// This fix only works on Google Maps because isGesture is NOT available on Apple Maps
+	if (!gesture.isGesture) {
+    return;
+  }
+
+  // You can use
+  dispatch({ type: "map_region", payload: { mapRegion: region }}); // if using useReducer
+	// setMapRegionState(region); // if using useState
+}}
+```
+
+Source: https://github.com/react-native-maps/react-native-maps/issues/846#issuecomment-1210079461
+
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      Copyright (c) 2017 Airbnb