fix: Fix Xcode 12 compatibility

  Reference: facebook/react-native#29633

Author: Rapsssito

react-native-tcp-socket.podspec

@@ -19,7 +19,7 @@ Pod::Spec.new do |s|
   s.source_files = "ios/**/*.{h,m,swift}"
   s.requires_arc = true
 
-  s.dependency "React"
+  s.dependency "React-Core"
   s.dependency "CocoaAsyncSocket"
 
 end