🐛 Fix React dependency to enable Xcode 12 build (#19)

Author: harunsmrkovic

react-native-get-random-values.podspec

@@ -16,5 +16,5 @@ Pod::Spec.new do |s|
   s.source_files = "ios/**/*.{h,m,swift}"
   s.requires_arc = true
 
-  s.dependency "React"
+  s.dependency "React-Core"
 end