chore: extract RCTConvert (#551)

Author: vonovak

example/ios/DocumentPickerExample.xcodeproj/project.pbxproj

@@ -347,7 +347,7 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "export NODE_BINARY=node\n../node_modules/react-native/scripts/react-native-xcode.sh";
+			shellScript = "export NODE_BINARY=node\n../node_modules/react-native/scripts/react-native-xcode.sh\n";
 		};
 		2D02E4CB1E0B4B27006451C7 /* Bundle React Native Code And Images */ = {
 			isa = PBXShellScriptBuildPhase;