Update README.md

Author: GabrielMajeri

README.md

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 # ucs2-rs
 
 [![UCS2 crate on crates.io](https://img.shields.io/crates/v/ucs2.svg)](https://crates.io/crates/ucs2)
+[![UCS2 docs on docs.rs](https://docs.rs/ucs2/badge.svg)](https://docs.rs/ucs2)
+![Licensed under MPL-2.0](https://img.shields.io/github/license/GabrielMajeri/ucs2-rs.svg)
 
 UCS-2 handling for Rust.