title: react-native-maps support offline google maps
body: <p>I am new to react-native, and I am going to develop an application by using  third-party library called  react-native-maps. Currently, everything just working find with online map as this third-party library is used google map. But my problem is went I move to offline mode it would be caused a problem for my application. </p>
  
  <p>My question is there any possible way to make google maps downloaded/cached when the application is load with the specific bound area of a country?</p>
  
  <p>Thank you in advance.</p>