pyproject.toml: clarify build system version

[adamjstewart]

See jupyter/jupyter-packaging#120

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[codecov-commenter]

Codecov Report

Merging #634 (b50327c) into master (82cd791) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #634      +/-   ##
==========================================
- Coverage   77.77%   77.73%   -0.04%     
==========================================
  Files         110      110              
  Lines       10444    10444              
  Branches     1415     1415              
==========================================
- Hits         8123     8119       -4     
- Misses       1921     1924       +3     
- Partials      400      401       +1     

Impacted Files	Coverage Δ
jupyter_server/services/kernels/handlers.py	60.40% <0.00%> (-1.53%)	⬇️
jupyter_server/tests/services/kernels/test_api.py	97.60% <0.00%> (+1.59%)	⬆️

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[vidartf]

It wasn't immediately clear to me if ~=0.9 translated to (A) >=0.9, ==0.9.* or (B) >=0.9, ==0.*, but it turns out (B) is the behavior 👍

[blink1073]

I think we want this to be >=0.10,<2 since we are compatible with the planned 1.0 interface for Jupyter-packaging

[adamjstewart]

I can do that if you want, just didn't want to change the current behaviour without a jupyter expert to tell me to

[adamjstewart]

Does that mean this is no longer compatible with 0.9?

[blink1073]

It is, this just sets a minimum on what will be used in the build environment

[adamjstewart]

Hmm, I'm comfortable with changing the upper bound since 1.X hasn't been released yet anyway, but I'm not sure if I'm comfortable with changing the lower bound. If this currently builds with 0.9, I see no reason to increase the lower bound.

[blink1073]

Fair. 😄

[adamjstewart]

@vidartf is this ready to merge or would you like to see any of the additional changes recommended by @blink1073?

[Zsailer]

This LGTM.

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