Update README.md

README.md

@@ -7,20 +7,20 @@
 [![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg?style=flat)](https://github.com/younatics/YNDropDownMenu/blob/master/LICENSE)
 [![Build Status](https://travis-ci.org/younatics/YNDropDownMenu.svg?branch=master)](https://travis-ci.org/younatics/YNDropDownMenu)
 [![Platform](https://img.shields.io/cocoapods/p/YNDropDownMenu.svg?style=flat)](http://cocoapods.org/pods/YNDropDownMenu)
-[![Swift 3.0](https://img.shields.io/badge/Swift-3.0-orange.svg?style=flat)](https://developer.apple.com/swift/)
+[![Swift 4.0](https://img.shields.io/badge/Swift-4.0-orange.svg?style=flat)](https://developer.apple.com/swift/)
 
 ## Updates
 See [CHANGELOG](https://github.com/younatics/YNDropDownMenu/blob/master/CHANGELOG.md) for details
 
 ## Intoduction
-The eligible dropdown menu for iOS, written in Swift 3, appears dropdown menu to display a view of related items when a user click on the dropdown menu. You can customize dropdown view whatever you like (e.g. UITableView, UICollectionView... etc)
+The eligible dropdown menu for iOS, written in Swift 4, appears dropdown menu to display a view of related items when a user click on the dropdown menu. You can customize dropdown view whatever you like (e.g. UITableView, UICollectionView... etc)
 
 ![demo](https://github.com/younatics/YNDropDownMenu/blob/master/Images/YNDropDownMenu.gif?raw=true)
 ![demo2](https://github.com/younatics/YNDropDownMenu/blob/master/Images/YNDropDownMenu2.gif?raw=true)
 
 ## Requirements
 
-`YNDropDownMenu` written in Swift 3. Compatible with iOS 8.0+
+`YNDropDownMenu` written in Swift 4. Compatible with iOS 8.0+
 
 ## Installation