fix(ios): link MobileCoreServices to resolve undefined symbols error on build (#715)

* fix: link MobileCoreServices to resolve undefined symbols error on build

* fix space

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Co-authored-by: Vojtech Novak <vonovak@gmail.com>

Author: jpancotti

react-native-document-picker.podspec

@@ -18,6 +18,8 @@ Pod::Spec.new do |s|
   s.source_files = "ios/**/*.{h,m,mm}"
 
   s.dependency "React-Core"
+
+  s.frameworks = 'MobileCoreServices'
 
   # This guard prevent to install the dependencies when we run `pod install` in the old architecture.
   if ENV['RCT_NEW_ARCH_ENABLED'] == '1' then