Added warcat-rs (#157)

which appears to still be in development...

README.md

@@ -171,6 +171,7 @@ This list of tools and software is intended to briefly describe some of the most
 * [Sparkling](https://github.com/internetarchive/Sparkling) - Internet Archive's Sparkling Data Processing Library. *(Stable)*
 * [Unwarcit](https://github.com/emmadickson/unwarcit) - Command line interface to unzip WARC and WACZ files (Python).
 * [Warcat](https://github.com/chfoo/warcat) - Tool and library for handling Web ARChive (WARC) files (Python). *(Stable)*
+* [Warcat-rs](https://github.com/chfoo/warcat-rs) - Command-line tool and Rust library for handling Web ARChive (WARC) files. *(In Development)* 
 * [warcio](https://github.com/webrecorder/warcio) - Streaming WARC/ARC library for fast web archive IO (Python). *(Stable)*
 * [warctools](https://github.com/internetarchive/warctools) - Library to work with ARC and WARC files (Python).
 * [webarchive](https://github.com/richardlehane/webarchive) - Golang readers for ARC and WARC webarchive formats (Golang).