Copy documentation from readme to lib.rs crate documentation
I'm only speaking for myself here, but I rarely if ever look at the README (via crates.io). I actually only discovered that this project has more documentation on the README through the involvement with a pull request I recently submitted. I usually just look at the docs.rs page for a crate. (https://docs.rs/enum_dispatch)
I think it would be a good idea to copy the existing documentation into the already existing crate-level documentation in lib.rs
, so that people like me don't miss out. For example the recent addition for better support for generics is currently not documented on docs.rs.