Add support for python 3.10

[jules-ch]

No description provided.

[jules-ch]

There is something wrong with the readthedocs pipeline, it seems to come from docutils 0.18 which is incompatible with sphinx version.

There is a step with some requirements hardcoded, I just don't know where they come from, is it from readthedocs settings?

/home/docs/checkouts/readthedocs.org/user_builds/pint/envs/develop/bin/python -m pip install --upgrade --no-cache-dir mock==1.0.1 pillow==5.4.1 alabaster>=0.7,<0.8,!=0.7.5 commonmark==0.8.1 recommonmark==0.5.0 sphinx<2 sphinx-rtd-theme<0.5 readthedocs-sphinx-ext<2.2

[jules-ch]

it installs sphinx<2, which has docutils>=0.11 in requirements installing docutils 0.18 (released 11hours ago) which is incompatible.
https://github.com/sphinx-doc/sphinx/blob/v1.8.5/setup.py#L18-L31

We'll have to pin some of those requirements & remove the hardcoded steps in read the docs @hgrecco

[hgrecco]

Can you try editing requirements_docs.txt?

[keewis]

remove the hardcoded steps in read the docs

that's not possible, those are hard-coded by RTD's build system. The official way to override those (according to their docs) is to pin the dependencies in a requirements file.

[jules-ch]

We'll do that then