Update README on how to use Carthage

Author: onmyway133

README.md

@@ -302,20 +302,26 @@ Alamofire.request("https://gameofthrones.org/mostFavoriteCharacter").responseStr
 
 ## Installation
 
+### Cocoapods
+
 **Cache** is available through [CocoaPods](http://cocoapods.org). To install
 it, simply add the following line to your Podfile:
 
 ```ruby
 pod 'Cache'
 ```
 
+### Carthage
+
 **Cache** is also available through [Carthage](https://github.com/Carthage/Carthage).
 To install just write into your Cartfile:
 
 ```ruby
 github "hyperoslo/Cache"
 ```
 
+You also need to add `SwiftHash.framework` in your [copy-frameworks](https://github.com/Carthage/Carthage#if-youre-building-for-ios-tvos-or-watchos) script.
+
 ## Author
 
 [Hyper](http://hyper.no) made this with ❤️