Merge pull request #417 from xfix/patch-1

Add enum-map

README.md

@@ -621,6 +621,7 @@ See also [Are we (I)DE yet?](https://areweideyet.com/) and [Rust and IDEs](https
 * [fizyk20/generic-array](https://github.com/fizyk20/generic-array) – a hack to allow for arrays sized by typenums [<img src="https://api.travis-ci.org/fizyk20/generic-array.svg?branch=master">](https://travis-ci.org/fizyk20/generic-array)
 * [Nemo157/roaring-rs](https://github.com/Nemo157/roaring-rs) – Roaring Bitmaps in Rust [<img src="https://api.travis-ci.org/Nemo157/roaring-rs.svg?branch=master">](https://travis-ci.org/Nemo157/roaring-rs)
 * [reem/rust-typemap](https://github.com/reem/rust-typemap) — [<img src="https://api.travis-ci.org/reem/rust-typemap.svg?branch=master">](https://travis-ci.org/reem/rust-typemap)
+* [xfix/enum-map](https://github.com/xfix/enum-map) [[enum-map](https://crates.io/crates/enum-map)] — An optimized map implementation for enums using an array to store values. [<img src="https://api.travis-ci.org/xfix/enum-map.svg?branch=master">](https://travis-ci.org/xfix/enum-map)
 
 ### Data Visualization