Bump version to 0.4.0

Author: devxoul

README.md

@@ -106,13 +106,13 @@ RxKeyboard.instance.frame
 - **Using [CocoaPods](https://cocoapods.org)**:
 
     ```ruby
-    pod 'RxKeyboard', '~> 0.3'
+    pod 'RxKeyboard', '~> 0.4'
     ```
 
 - **Using [Carthage](https://github.com/Carthage/Carthage)**:
 
     ```
-    github "devxoul/RxKeyboard" ~> 0.3
+    github "devxoul/RxKeyboard" ~> 0.4
     ```
 
 ## License

RxKeyboard.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = 'RxKeyboard'
-  s.version          = '0.3.0'
+  s.version          = '0.4.0'
   s.summary          = 'Reactive Keyboard in iOS'
   s.homepage         = 'https://github.com/devxoul/RxKeyboard'
   s.license          = { :type => 'MIT', :file => 'LICENSE' }