title: react-native-flexi-radio-button onselect is not function
body: <p>I want to use react-native-flexi-radio-button in my project to select one of the item in list form array and use this code</p>
  
  <pre><code> {this.state.Rooms.map(function (value,index) {
  
                      console.log(value.id)
  
                      return(
                          &lt;RadioGroup  onSelect ={(index, value) =&gt; this.onSelect(index, value)}&gt;
                              &lt;RadioButton value={value.id} isSelected={false} index={index}&gt;
                                  {/*&lt;Text&gt;{i.title}&lt;/Text&gt;*/}
                              &lt;/RadioButton&gt;
                          &lt;/RadioGroup&gt;
                      )
  
                  })
  
                  }
  </code></pre>
  
  <p>but when i click on any button, it returns <code>_this3.onselect is not function</code> and its this function</p>
  
  <pre><code>  onSelect=(index,value)=&gt;{
        console.log(index,value)
      }
  </code></pre>
  
  <p>how to solve this?</p>