title: Getting Cursor Position on TextInput React-Native
body: <p>Does anyone have any ideas on how to get the caret position of a <code>TextInput</code>? I tried <code>onSelectionChange</code> and creating an event emitter from <code>DocumentSelectionState</code> but neither appear to be working (they don't fire anything, no matter what I select).</p>
  
  <p>For Example: <a href="https://rnplay.org/apps/eZnvIA" rel="noreferrer">https://rnplay.org/apps/eZnvIA</a></p>