Update readme.md (#226)

Joel · leobalter · commit a1ac6b382df2 · 2018-11-19T14:15:12.000-05:00
Adding Jest among the testing frameworks.
diff --git a/readme.md b/readme.md
@@ -129,6 +129,7 @@ Projects _must_ include some form of unit, reference, implementation or function
  * [Buster.js](http://busterjs.org/)
  * [Sinon.js](http://sinonjs.org/)
  * [Tape](https://github.com/substack/tape)
+ * [Jest](https://facebook.github.io/jest/)
 
 ## Table of Contents
 
