Documentation link on crates.io broken

The link on [crates.io](https://crates.io/crates/multi-map) points to [https://thejpster.github.io/multi-map/doc/multi_map/index.html](https://thejpster.github.io/multi-map/doc/multi_map/index.html) which does not exist.  Other crates are pointing to [docs.rs]( docs.rs), so I guess [https://docs.rs/multi-map](https://docs.rs/multi-map) might be a better option in the cargo.toml