Update requirements in the README

Author: RadAzzouz

README.md

@@ -24,8 +24,8 @@ The [PSPDFKit SDK](https://pspdfkit.com/) is a framework that allows you to view
 
 #### Requirements
 
-- Xcode 10.1
-- PSPDFKit 8.1.3 for iOS or later
+- Xcode 10.2
+- PSPDFKit 8.2.3 for iOS or later
 - react-native >= 0.57.8
 
 #### Getting Started