Add output level

[Xinyu Jian]

Could you please add this feature? So that we can easily classify the debug level, e.g., INFO, WARNING, ERROR. Thanks!

[David Peter]

Thank you for your request. I don't really intend to develop this into a full-blown logging library. I don't think dbg(…) needs logging levels.

[Xinyu Jian]

Understand. Thanks for your work!