Update SimpleRadioButton.js

Author: Viveksmart93

lib/SimpleRadioButton.js

@@ -44,6 +44,11 @@ export default class RadioForm extends React.Component {
     this.props.onPress(this.props.radio_props[index], index)
   }
 
+  //This function is for clear the selection when we are using the library in multiple choice questions
+  clearSelection(){
+    this.setState({is_active_index:-1});
+  }
+
   _renderButton(obj, i) {
     return (
       <RadioButton