Added 'Seeking Maintainers' notice

[jspizziri]

Changes proposed in this pull request:

• Remove an outdated hiatus notice from README.md.

[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ Jacob Spizziri (d120725)

[jspizziri]

I must say, the amount of paperwork I had to go through to submit this PR was pretty comical.

[acao]

Thanks! Can you replace this with the pinned seeking co-maintainers issue?

[acao]

There are quite a few new co-maintainers on this project we need to list in the readme, better now than never!

There are folks from Prisma, GraphCDN and the guild all as co-maintainers, also several folks at apollo have been added, as they are looking into retiring the fork they've been publishing. Variously added last fall until this year. 2022 should see a lot more activity!

[jspizziri]

@acao I updated the notice. If you list the maintainers I can add a section documenting them as well. LMK what you need there.

[acao]

Thank you! We will provide this list of active maintainers soon. Hoping folks will step forward!