Update support schedule in READMEs

[sandersn]

I'm pretty sure I didn't mess up the non-English readmes, but it might be nice to have some other people look.

[typescript-bot]

@sandersn Thank you for submitting this PR!

This PR touches some part of DefinitelyTyped infrastructure, so a DT maintainer will need to review it. This is rare - did you mean to do this?

Code Reviews

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• ✅ No merge conflicts
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---

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[sandersn]

I guess I can't add non-DT members as reviewers? So here's a manual ping: @galkin @saschanaz @Kingwl

[saschanaz]

LGTM

[typescript-bot]

@sandersn Everything looks good here. Great job! I am ready to merge this PR on your behalf.

If you'd like that to happen, please post a comment saying:

Ready to merge

and I'll merge this PR almost instantly. Thanks for helping out! ❤️