Update version requirement in repository README

[Bluenix2]

It seems like the repository README was left unchanged after #881 and #893 - this PR addresses that by updating the README for the whole repository.

[the-knights-who-say-ni]

Hello, and thanks for your contribution!

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@Bluenix2

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[srittau]

This comment is actually correct. It's talking about the now-obsolete typing backport, not about typing-extensions.

[AA-Turner]

That refers to the backport of the typing module (https://pypi.org/project/typing/), which has been removed. There might be value in adding a note about typing_extensions though?

[Bluenix2]

I could certainly repurpose this pull request for that purpose - I just have two questions about the CLA:

• Believe it or not my name is not Bluenix, do I need to sign with my real-life name?

• What about the address, is country enough or do I need to provide street name and number?

If possible I would prefer not to reveal my real-life name and address.

[JelleZijlstra]

I don't think any of us know a whole lot about the CLA, sorry (or, for example, why we can get away with not having a CLA requirement on typeshed).

[Bluenix2]

Shortly after this I finally found an email to contact and got my questions answered, I also signed the CLA.

That said, there is not much of a use for this PR so I'll go ahead and close it.