Update README.md

Author: TonioMacaronio

README.md

@@ -133,7 +133,7 @@ $ brew install carthage
 To integrate web3swift into your Xcode project using Carthage, specify it in your `Cartfile`:
 
 ```ogdl
-github "web3swift/web3swift" ~> 1.1.9
+github "matterinc/web3swift" "carthage"
 ```
 
 Run `carthage update` to build the framework and drag the built `web3swift.framework` into your Xcode project.