Update README.rst

[marimeireles]

Hi!
I'm the maintainer of pyls-memestra and I'd like to add it here as a 3rd party plugin :)
Please let me know if I should add this info somewhere else.
Thank you for open sourcing the project and for all the work!
Cheers.

[palantirtech]

Thanks for your interest in palantir/python-language-server, @marimeireles! Before we can accept your pull request, you need to sign our contributor license agreement - just visit https://cla.palantir.com/ and follow the instructions. Once you sign, I'll automatically update this pull request.

[ccordoba12]

Hey @marimeireles, thanks for you interest in this project! Right now, the community is seeking to migrate it to a new organization so we can properly maintain it:

https://github.com/python-ls

The thing is no one from the community has permissions in this repo to merge PRs and create new releases.

You're welcome to participate on that organization!

[marimeireles]

Hey @ccordoba12. Thank you very much!

[krassowski]

For anyone else coming here the new link is https://github.com/python-lsp/python-lsp-server