title: Zoom to specified markers react-native-maps
body: <p>There is a section in the <a href="https://github.com/airbnb/react-native-maps#zoom-to-specified-markers" rel="noreferrer">react-native-maps</a> docs for zooming to an array of markers, however there are no code examples on how to do this either in the docs or in the examples folder (from what I can find)</p>
  
  <p>Can anyone provide an example of how to do this?</p>