Update versions in read me

README.md

@@ -67,7 +67,7 @@ source 'https://github.com/CocoaPods/Specs.git'
 platform :ios, '8.0'
 use_frameworks!
 
-pod 'Kingfisher', '~> 2.2'
+pod 'Kingfisher', '~> 2.3'
 ```
 
 Then, run the following command:
@@ -92,7 +92,7 @@ $ brew install carthage
 To integrate Kingfisher into your Xcode project using Carthage, specify it in your `Cartfile`:
 
 ``` ogdl
-github "onevcat/Kingfisher" ~> 2.2
+github "onevcat/Kingfisher" ~> 2.3
 ```
 
 Then, run the following command to build the Kingfisher framework:
@@ -346,3 +346,5 @@ Follow and contact me on [Twitter](http://twitter.com/onevcat) or [Sina Weibo](h
 ## License
 
 Kingfisher is released under the MIT license. See LICENSE for details.
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