Fixed cocoapods link

Author: RuiAAPeres

README.md

@@ -1,7 +1,7 @@
 # Receiver
 
 <a href="https://github.com/Carthage/Carthage"><img src="https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat"></a>
-<a href=""><img src="https://img.shields.io/cocoapods/v/Receiver.svg?style=flat"></a>
+<a href="https://github.com/RuiAAPeres/Receiver#cocoapods"><img src="https://img.shields.io/cocoapods/v/Receiver.svg?style=flat"></a>
 [![codecov](https://codecov.io/gh/RuiAAPEres/Receiver/branch/master/graph/badge.svg)](https://codecov.io/gh/RuiAAPeres/Receiver)
 [![Build Status](https://travis-ci.org/RuiAAPeres/Receiver.svg?branch=master)](https://travis-ci.org/RuiAAPeres/Receiver)
 [![Swift 3.0](https://img.shields.io/badge/Swift-4.0-orange.svg?style=flat)](https://developer.apple.com/swift/)