Update Readme

Author: RadAzzouz

README.md

@@ -22,8 +22,8 @@ The [PSPDFKit SDK](https://pspdfkit.com/) is a framework that allows you to view
 
 #### Requirements
 
-- Xcode 9.4.1
-- PSPDFKit 7.6.1 for iOS or later
+- Xcode 10
+- PSPDFKit 8.0 for iOS or later
 - react-native >= 0.55.4
 
 #### Getting Started