fix: updated react dependency in podspec to enable build in Xcode 12 (for iOS >= 12) (#246)

Author: alexisbronchart

react-native-sensitive-info.podspec

@@ -15,5 +15,5 @@ Pod::Spec.new do |s|
   s.source       = { :git => "https://github.com/mCodex/react-native-sensitive-info", :tag => "v#{s.version}" }
   s.source_files  = "ios/**/*.{h,m}"
 
-  s.dependency 'React'
-end
+  s.dependency 'React-Core'
+end