docs: Clarify location of RNDeviceInfo.xcodeproj (#686)
docs: Clarify location of RNDeviceInfo.xcodeproj (#686)

Under the iOS "Manual Linking" section, there is no file with the extension `.xcodeproj` in the location specified in the README. I have updated this section to specify the correct location of this file.
rebeccahughes/react-native-device-info,rebeccahughes/react-native-device-info,rebeccahughes/react-native-device-info,rebeccahughes/react-native-device-info,rebeccahughes/react-native-device-info,rebeccahughes/react-native-device-info