Update README.md

Remove Cocoapods Badge

• For some reason, cocoapods badge is showing 0 downloads a month.
• Temporarily removing the badge until we can discover why this is.

Author: Nightsd01

README.md

@@ -3,7 +3,7 @@
 </p>
 
 ### OneSignal iOS SDK
-[![CocoaPods](https://img.shields.io/cocoapods/v/OneSignal.svg)](https://cocoapods.org/pods/OneSignal) [![CocoaPods](https://img.shields.io/cocoapods/dm/OneSignal.svg)](https://cocoapods.org/pods/OneSignal) [![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg)](https://github.com/Carthage/Carthage) [![Build Status](https://travis-ci.org/OneSignal/OneSignal-iOS-SDK.svg?branch=master)](https://travis-ci.org/OneSignal/OneSignal-iOS-SDK)
+[![CocoaPods](https://img.shields.io/cocoapods/v/OneSignal.svg)](https://cocoapods.org/pods/OneSignal) [![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg)](https://github.com/Carthage/Carthage) [![Build Status](https://travis-ci.org/OneSignal/OneSignal-iOS-SDK.svg?branch=master)](https://travis-ci.org/OneSignal/OneSignal-iOS-SDK)
 
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