Add Gutenberg a static site generator.

README.md

@@ -968,6 +968,8 @@ See also [Are we web yet?](http://www.arewewebyet.org) and [Rust web framework c
 * Miscellaneous
   * [cargonauts](https://github.com/cargonauts-rs/cargonauts) — A web framework intended for building maintainable, well-factored web apps.
   * [doublifyapis/toolkit-rust](https://github.com/doublifyapis/toolkit-rust) — Doublify API toolkit for Rust [<img src="https://api.travis-ci.org/doublifyapis/toolkit-rust.svg?branch=master">](https://travis-ci.org/doublifyapis/toolkit-rust)
+* Static Site Generators
+  * [Keats/gutenberg](https://github.com/Keats/gutenberg) [[gutenberg](https://www.getgutenberg.io/)] — An opinionated static site generator with everything built-in. [![Build Status](https://travis-ci.org/Keats/gutenberg.svg?branch=master)](https://travis-ci.org/Keats/gutenberg)
 
 
 ## Resources