Lwt 4.1.0, first release with MIT license!

Switching to the MIT license is actually the main reason to release Lwt now, so this release is a bit sparse compared to most :slight_smile: There are, however, other nice additions and fixes. See the changelog below.

Lwt_io.establish_server_with_client_socket was added to help port http/af to Lwt. http/af is the fast new HTTP server by @seliopou. This should be coming out soon.


Bugs fixed


Thanks to all the contributors who worked on this release, and to past contributors for agreeing to the license switch!