title: React Native - TextInput - How to use value & defaultValue together
body: <p>I got the following Component and I want to init TextInput with defaultValue and then when user type update the value of it.</p>
  
  <p>How do I do that?</p>
  
  <p>Here what I've tried - but this way TextInput is always empty on initialization.</p>
  
  <pre><code>class Note extends Component {
      state = {
          text: ""
      };
  
      render() {
          const {onChange} = this.props;
  
          return (
                  &lt;TextInput
                      onChangeText={(text) =&gt; {
                           this.setState({text}); 
                           onChange(text);
                      }
                      value={this.state.text}
                      defaultValue={this.props.text}
                  /&gt;
          );
      } }
  </code></pre>
  
  <p>"react": "^16.4.1"<br>
  "react-native": "^0.55.4",</p>