update README examples

README.md

@@ -17,8 +17,8 @@ from tiramisu import IntOption, StrOption, BoolOption, ChoiceOption, \
 choiceoption = ChoiceOption('cmd',
                             'choice the sub argument',
                             ('str', 'list', 'int'),
-                            properties=('mandatory',
-                                        'positional'))
+                            properties=('mandatory',))
+#                                        'positional'))
 # * a boolean to pass script in verbosity mode with argument -v --verbosity
 booloption = BoolOption('verbosity',
                         'increase output verbosity',
@@ -60,9 +60,7 @@ config = Config(OptionDescription('root',
                                    int_
                                    ]))
 # initialise the parser
-parser = TiramisuCmdlineParser()
-# add the config to parser
-parser.add_arguments(config)
+parser = TiramisuCmdlineParser(config)
 # parse arguments of current script
 parser.parse_args()
 # now, print the result