Allow for markdown-it-py v2.0

[chrisjsewell]

This implements some internal changes, but won't affect jupytext
(see https://github.com/executablebooks/markdown-it-py/releases/tag/v2.0.0)

[chrisjsewell]

Could also update environment.yml, although v2 is not on conda just yet

[mwouts]

Hi @chrisjsewell , sure I can take this. You seem to still allow markdown-it-py~=1.0, is this intended? If so we could replicate what you did on the requirements.txt file to the environment.yaml one, don't you think so?

Also, do you want me to merge this now or should I wait for markdown-it-py==2.0 to reach conda?

[chrisjsewell]

You seem to still allow markdown-it-py~=1.0, is this intended?

Yep, the changes from v1 -> v2 don't specifically impact jupytext functionality, so both can be used fine

[chrisjsewell]

Also, do you want me to merge this now or should I wait for markdown-it-py==2.0 to reach conda?

updated environment.yaml, so yeh fine to merge now

[mwouts]

Merged just now, thank you @chrisjsewell !

[mwouts]

Hi @chrisjsewell , maybe we should also update that line?

jupytext/setup.py

Line 39 in f843c54

"markdown-it-py~=1.0",

And this other one (for the conda package)?

https://github.com/conda-forge/jupytext-feedstock/blob/6283a34bc51a63514b5bbb90955d31c159586a2e/recipe/meta.yaml#L32

If you confirm I can prepare a fix tomorrow.

[dotlambda]

Please update the version constraint in setup.py.