Add rspark library

▁▂▆▇▁▄█▁ Sparklines for Rust apps.

README.md

@@ -700,6 +700,8 @@ See also [About Rust’s Machine Learning Community](https://medium.com/@autumn_
   * [docopt/docopt.rs](https://github.com/docopt/docopt.rs) [[docopt](https://crates.io/crates/docopt)] — A Rust implementation of [DocOpt](http://docopt.org) [<img src="https://api.travis-ci.org/docopt/docopt.rs.svg?branch=master">](https://travis-ci.org/docopt/docopt.rs)
   * [TeXitoi/structopt](https://github.com/TeXitoi/structopt) [[structopt](https://crates.io/crates/structopt)] — parse command line argument by defining a struct [<img src="https://api.travis-ci.org/TeXitoi/structopt.svg?branch=master">](https://travis-ci.org/TeXitoi/structopt)
   * [killercup/quicli](https://github.com/killercup/quicli) [[quicli](https://crates.io/crates/quicli)] — quickly build cool CLI apps in Rust [<img src="https://api.travis-ci.org/killercup/quicli.svg">](https://travis-ci.org/killercup/quicli)
+* Data visualization
+  * [reugn/rspark](https://github.com/reugn/rspark) [[rspark](https://crates.io/crates/rspark)] - ▁▂▆▇▁▄█▁ Sparklines for Rust apps [<img src="https://travis-ci.org/reugn/rspark.svg?branch=master">](https://travis-ci.org/reugn/rspark)
 * Human-centered design
   * [rust-cli/human-panic](https://github.com/rust-cli/human-panic) [[human-panic](https://crates.io/crates/human-panic)] — panic messages for humans [<img src="https://api.travis-ci.org/rust-cli/human-panic.svg">](https://travis-ci.org/rust-cli/human-panic)
 * Line editor