README.md: More badges and docs link
-# TAI64(N) for Rust [![Build Status][build-image]][build-link]
+# TAI64(N) for Rust [![Crate][crate-image]][crate-link] [![Docs][docs-image]][docs-link] [![Build Status][build-image]][build-link]
+[crate-image]: https://img.shields.io/crates/v/tai64.svg
+[crate-link]: https://crates.io/crates/tai64
+[docs-image]: https://docs.rs/tai64/badge.svg
+[docs-link]: https://docs.rs/tai64/
[build-image]: https://travis-ci.org/tarcieri/tai64-rs.svg?branch=master
[build-link]: https://travis-ci.org/tarcieri/tai64-rs
An implementation of the [TAI64(N)] (*Temps Atomique International*) timestamp
format in Rust.
+[Documentation][docs-link]
+
[TAI64(N)]: https://cr.yp.to/libtai/tai64.html
## License
