Version 1.0 release

This is the issue to cover things we need to do to finish the release.

@scikit-learn/core-devs please tag this issue when you want a PR to be backported to 1.0 from now 😃

Question: the travis job triggered by [cd build] succeeded, but we don’t have any ARM wheels on the anaconda repo, I’m puzzled.

• update news and what’s new date in release branch
• update news and what’s new date and sklearn dev0 version in main branch
• check that the for the release wheels can be built successfully
• merge the PR with [cd build] commit message to upload wheels to the staging repo
• upload the wheels and source tarball to https://test.pypi.org
• create tag on the main github repo
• upload the wheels and source tarball to PyPI
• https://github.com/scikit-learn/scikit-learn/releases draft
• confirm bot detected at https://github.com/conda-forge/scikit-learn-feedstock and wait for merge
• https://github.com/scikit-learn/scikit-learn/releases publish
• <del>fix the binder release version in .binder/requirement.txt (see #15847)</del>
• announce on mailing list, LinkedIn, and on twitter

[ogrisel]

I think we can close this one. Thanks everyone and @adrinjalali in particular!

[adrinjalali]

we probably would keep 3.7 on main for at least the first two minor releases maybe. But once it’s time to do so, then you’re more than welcome to remove all the 3.7 stuff 😄