Fixed closing selection problem

Author: alvaromb

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2018 InterfaceKit
+Copyright (c) 2018 APSL
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -25,7 +25,11 @@ import CascadePicker from 'react-native-js-cascade-picker'
 <CascadePicker
   options={[{ value: 2, label: 'Two' }, { value: 4, label: 'Four' }]}
   valueSelected={this.state.val}
-  onChange={(option: Object) => this.setState({ val: option.value })}
+  onChange={(option: ?Object) => {
+    if (option) {
+      this.setState({ val: option.value })
+    }
+  }}
   pickerText='Select one'
 />
 ```

lib/MainOptionButton.js

@@ -49,14 +49,18 @@ class MainOptionButton extends React.PureComponent<Props> {
     }
   }
 
+  _onPressMainButton = () => {
+    this.props.onPress()
+  }
+
   render() {
     const rotate = this._anim.interpolate({
       inputRange: [0, 100],
       outputRange: ['0deg', '180deg']
     })
     return (
       <TouchableElement
-        onPress={this.props.onPress}
+        onPress={this._onPressMainButton}
         style={[this.props.style, styles.container]}>
         <View style={styles.textContainer}>
           <Text style={[styles.text, this.props.textStyle]}>