Reference Jest in TestUtils documentation.

Author: kmeht

docs/docs/09.4-test-utils.md

@@ -7,7 +7,7 @@ prev: class-name-manipulation.html
 next: clone-with-props.html
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-`React.addons.TestUtils` makes it easy to test React components in the testing framework of your choice (we use [Jasmine](http://jasmine.github.io) with [jsdom](https://github.com/tmpvar/jsdom)).
+`React.addons.TestUtils` makes it easy to test React components in the testing framework of your choice (we use [Jest](http://facebook.github.io/jest/)).
 
 ### Simulate