Revert "Dynamic framework (#412)"

This reverts commit ad7ce9f.

Author: Nightsd01

OneSignal.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = "OneSignal"
-  s.version          = "2.8.6"
+  s.version          = "2.8.7"
   s.summary          = "OneSignal push notification library for mobile apps."
   s.homepage         = "https://onesignal.com"
   s.license          = { :type => 'MIT', :file => 'LICENSE' }

OneSignalDynamic.podspec

@@ -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)
 
 ---