Exclude tests from dist

[bollwyvl]

• fixes Remove tests from distributions, or put in-tree, or... ? #35

This is the lowest-change, easiest-to-review approach.

Can also work up something that:

• adopts the generally-less-error-prone src/nbclassic/ approach or
• adopts the generally-more-downstream-usable src/nbclassic/tests approach

[bollwyvl]

grah, this is the new pip resolver thing, i guess. i dunno, folks. seems shady. I can keep fighting it, but am a bit out of the loop on all the renaming... and why it's bringing in 1.1.0dev in the first place, and why that constitutes a breaking change.

[bollwyvl]

Gah, we're back in the hell that is tornado vs windows vs asyncio vs py38+.

jupyter-server/jupyter_server#339 pays the piper and does the hard cut to tornado>=6.1... but for this package, it would require a coordinated release with notebook and probably other things that carry the great wounds of that fiasco.

[Zsailer]

jupyter_server 1.0.9 has been released and pins tornado>=6.1. Kicked CI here and everything is green! 🎉 Thanks, @bollwyvl!

[bollwyvl]

Crazy! Glad it worked out. So do we also need to bump the pin here to ~=1.0.9 prior to the next release?

[Zsailer]

Oops, just released nbclassic 0.2.4 before I saw this.

Yeah, I think it would be a good idea to pin to jupyter_server~=1.0.9.