Fix code formatting in README file.
Fix code formatting in README file.

stuart-thackray/nitrogen,stuart-thackray/nitrogen,nitrogen/nitrogen,kevinmontuori/nitrogen,choptastic/nitrogen,joaohf/nitrogen,nitrogen/nitrogen,joaohf/nitrogen,stuart-thackray/nitrogen,kevinmontuori/nitrogen,kevinmontuori/nitrogen,choptastic/nitrogen,joaohf/nitrogen,nitrogen/nitrogen,choptastic/nitrogen