Updated README.md to correctly represent ar_moveit.launch.py

[oskarsVismanis]

I updated the README.md to correctly represent the ar_moveit.launch.py

    declared_arguments.append(
        DeclareLaunchArgument("ar_model",
                              default_value="mk1",
                              choices=["mk1", "mk2", "mk3"],
                              description="Model of AR4"))

although, to be consistent with the rest of the README.md, maybe the default value should be changed to mk3?

[ycheng517]

Thanks for the fix! I will change the default to mk3 shortly. I have a personal bias for the mk1 since that's what I have 😄

[oskarsVismanis]

mk1 is also the one available for me, so I'm alright with it staying that way 😄