doc: outdated maintainers list in README

[lukpueh]

The maintainers list in the Acknowledgement section of the main README.md is outdated.

Sync with up-to-date MAINTAINERS.md.

[joshuagl]

Do we want to explicitly name maintainers and their affiliation, or just provide a generic statement which links to the maintainer list?

Maintainers include collaborators from academia and industry.

[lukpueh]

The generic statement seems fine to me.