python 3.10 compatibility

[jeyca]

cannot install via pip with xubuntu python3.10:

  × python setup.py egg_info did not run successfully.
  │ exit code: 1
  ╰─> [2 lines of output]
      Detected Python 3, using 2to3
      error in pyserial setup command: use_2to3 is invalid.
      [end of output]

I think support for use_2to3 was dropped

[digitall]

#44 fixes this for me.

[kiteloopdesign]

yes it does. clone repo, make those same updates, then install via "pip install -e ."