Bump version.

.swift-version

@@ -1 +1 @@
-3.1.1
+4.0

KWDrawerController.podspec

@@ -1,7 +1,7 @@
 Pod::Spec.new do |s|
 
  s.name = 'KWDrawerController'
- s.version = '3.7'
+ s.version = '4.0'
  s.summary = 'Drawer view controller that easy to use!'
  s.license = { :type => 'MIT', :file => 'LICENSE' }
  s.homepage = 'https://github.com/kawoou/KWDrawerController'

LICENSE

@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2017 Kawoou (Jungwon An)
+Copyright (c) 2018 Kawoou (Jungwon An)
 
 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

@@ -4,7 +4,7 @@ KWDrawerController
 [![Pod Version](http://img.shields.io/cocoapods/v/KWDrawerController.svg?style=flat)](http://cocoadocs.org/docsets/KWDrawerController)
 [![Pod Platform](http://img.shields.io/cocoapods/p/KWDrawerController.svg?style=flat)](http://cocoadocs.org/docsets/KWDrawerController)
 [![Pod License](http://img.shields.io/cocoapods/l/KWDrawerController.svg?style=flat)](https://github.com/kawoou/KWDrawerController/blob/master/LICENSE)
-![Swift](https://img.shields.io/badge/Swift-3.0-orange.svg)
+![Swift](https://img.shields.io/badge/Swift-4.0-orange.svg)
 
 Drawer view controller that easy to use!
 
@@ -17,7 +17,11 @@ Installation
 KWDrawerController is available on [CocoaPods](https://github.com/cocoapods/cocoapods). Add the following to your Podfile:
 
 ```ruby
+// Swift 3.x
 pod 'KWDrawerController', '~> 3.7'
+
+// Swift 4
+pod 'KWDrawerController', '~> 4.0'
 ```
 
 
@@ -231,12 +235,12 @@ Changelog
 + 3.6 Fixed an occurs issue while the drawer was open and layout changing.
 + 3.6.1 Fixed layout issue when rotate device.
 + 3.7 Fixed not updating issues on properties.
++ 4.0 Support Swift 4.
 
 ⚠️ Requirements
 --------------
 
- - iOS 7.1+
- - Xcode 8.1+
+ - iOS 8.0+
  - Swift 3.0+