add some rudimentary grouping for "Compression"

README.md

@@ -278,13 +278,19 @@ See also [http://areweideyet.com/](http://areweideyet.com/) and [Rust and IDEs](
 
 ### Compression
 
-* [alexcrichton/bzip2-rs](https://github.com/alexcrichton/bzip2-rs) — [libbz2](http://www.bzip.org) bindings [<img src="https://travis-ci.org/alexcrichton/bzip2-rs.svg?branch=master">](https://travis-ci.org/alexcrichton/bzip2-rs)
-* [alexcrichton/flate2-rs](https://github.com/alexcrichton/flate2-rs) — [miniz](https://code.google.com/p/miniz/) bindings [<img src="https://travis-ci.org/alexcrichton/flate2-rs.svg?branch=master">](https://travis-ci.org/alexcrichton/flate2-rs)
-* [alexcrichton/tar-rs](https://github.com/alexcrichton/tar-rs) — tar archive reading/writing in Rust [<img src="https://travis-ci.org/alexcrichton/tar-rs.svg?branch=master">](https://travis-ci.org/alexcrichton/tar-rs)
-* [ende76/brotli-rs](https://github.com/ende76/brotli-rs) — implementation of [Brotli](http://google-opensource.blogspot.co.uk/2015/09/introducing-brotli-new-compression.html) compression
-* [dropbox/rust-brotli](https://github.com/dropbox/rust-brotli) — Brotli decompressor in Rust that optionally avoids the stdlib
-* [JeffBelgum/rust-snappy](https://github.com/JeffBelgum/rust-snappy) — [snappy](https://github.com/google/snappy) bindings [<img src="https://travis-ci.org/JeffBelgum/rust-snappy.svg?branch=master">](https://travis-ci.org/JeffBelgum/rust-snappy)
-* [slackito/zip](https://github.com/slackito/zip) — read and write ZIP archives [<img src="https://travis-ci.org/slackito/zip.svg?branch=master">](https://travis-ci.org/slackito/zip)
+* brotli
+  * [ende76/brotli-rs](https://github.com/ende76/brotli-rs) — implementation of [Brotli](http://google-opensource.blogspot.co.uk/2015/09/introducing-brotli-new-compression.html) compression
+  * [dropbox/rust-brotli](https://github.com/dropbox/rust-brotli) — Brotli decompressor in Rust that optionally avoids the stdlib
+* bzip2
+  * [alexcrichton/bzip2-rs](https://github.com/alexcrichton/bzip2-rs) — [libbz2](http://www.bzip.org) bindings [<img src="https://travis-ci.org/alexcrichton/bzip2-rs.svg?branch=master">](https://travis-ci.org/alexcrichton/bzip2-rs)
+* miniz
+  * [alexcrichton/flate2-rs](https://github.com/alexcrichton/flate2-rs) — [miniz](https://code.google.com/p/miniz/) bindings [<img src="https://travis-ci.org/alexcrichton/flate2-rs.svg?branch=master">](https://travis-ci.org/alexcrichton/flate2-rs)
+* snappy
+  * [JeffBelgum/rust-snappy](https://github.com/JeffBelgum/rust-snappy) — [snappy](https://github.com/google/snappy) bindings [<img src="https://travis-ci.org/JeffBelgum/rust-snappy.svg?branch=master">](https://travis-ci.org/JeffBelgum/rust-snappy)
+* tar
+  * [alexcrichton/tar-rs](https://github.com/alexcrichton/tar-rs) — tar archive reading/writing in Rust [<img src="https://travis-ci.org/alexcrichton/tar-rs.svg?branch=master">](https://travis-ci.org/alexcrichton/tar-rs)
+* zip
+  * [slackito/zip](https://github.com/slackito/zip) — read and write ZIP archives [<img src="https://travis-ci.org/slackito/zip.svg?branch=master">](https://travis-ci.org/slackito/zip)
 
 ### Computation