JupyterLab support

[anki-code]

Hi!

The xonsh kernel for Jupyter works perfect!

But now the JupyterLab is the new trend and the kernel is not working:

/opt/miniconda/lib/python3.8/site-packages/xonsh/jupyter_kernel.py:136: 
DeprecationWarning: zmq.eventloop.ioloop is deprecated in pyzmq 17. pyzmq now works 
with default tornado and asyncio eventloops.  ioloop.install()

Please add support for JupyterLab.

Thanks!

For community

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[joouha]

This should have been fixed by b6671d3

[anki-code]

It works! Thanks!