Link common Carthage issues

README.md

@@ -143,7 +143,7 @@ Specify in Cartfile:
 github "krzyzanowskim/CryptoSwift"
 ```
 
-Run `carthage` to build the framework and drag the built CryptoSwift.framework into your Xcode project. Follow [build instructions](https://github.com/Carthage/Carthage#getting-started)
+Run `carthage` to build the framework and drag the built CryptoSwift.framework into your Xcode project. Follow [build instructions](https://github.com/Carthage/Carthage#getting-started). [Common issues](https://github.com/krzyzanowskim/CryptoSwift/issues/492#issuecomment-330822874).
 
 #### Swift Package Manager