docs: def prog_version():
      """Print version, license and email
      """
      print("Version   : {0}\n"
            "Licence   : {1}\n"
            "Email     : {2}\n"
            "Maintainer: {3}".format(_meta_.__version__,
                                     _meta_.__license__,
                                     _meta_.__email__,
                                     _meta_.__maintainer__))