fix: Xcode 12 compatibility (#62)

Ref #61

Author: Pranit Harekar

react-native-progress-view.podspec

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