Add structopt to "command-line argument parsing"

README.md

@@ -441,6 +441,7 @@ See also [Are we (I)DE yet?](https://areweideyet.com/) and [Rust and IDEs](https
 
 * [docopt/docopt.rs](https://github.com/docopt/docopt.rs) — 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)
 * [kbknapp/clap-rs](https://github.com/kbknapp/clap-rs) — a simple to use, full featured command-line argument parser [<img src="https://api.travis-ci.org/kbknapp/clap-rs.svg?branch=master">](https://travis-ci.org/kbknapp/clap-rs)
+* [TeXitoi/structopt](https://github.com/TeXitoi/structopt) — parse command line argument by defining a struct. It combines clap with custom derive. [![Build status](https://travis-ci.org/TeXitoi/structopt.svg?branch=master)](https://travis-ci.org/TeXitoi/structopt)
 
 
 ### Command-line interface