Add `edict` to comparison table

[zakarumych]

Consider adding edict to the comparison table.
edict is an ECS with async support but at different angle. It also supports entity relations - AFAIK a feature you can't find in any other Rust ECS.

[zakarumych]

The main difference of async approach is that access to World is sync within tasks.
It is aimed to be used for async game logic rather than IO.

[schell]

Cool! Thanks for the pointer. I'm pretty busy these days so it may be quite a while before I can get to this, but I'd merge a PR if you managed one :)