message: crates.io and docs.rs badges
diff: A [Rust](https://www.rust-lang.org/) client for the [NATS messaging system](https://nats.io).
  [![License Apache 2](https://img.shields.io/badge/License-Apache2-blue.svg)](https://www.apache.org/licenses/LICENSE-2.0)
  +[![Crates.io](https://img.shields.io/crates/v/natsio.svg)](https://crates.io/crates/natsio)
  +[![Documentation](https://docs.rs/bustle/badge.svg)](https://docs.rs/bustle/)
  [![Build Status](https://travis-ci.org/nats-io/nats.rs.svg?branch=master)](http://travis-ci.org/nats-io/nats.rs)
  ## Motivation
  