Added ReactTestUtils.act() to CHANGELOG

Author: Brian Vaughn

content/blog/2019-02-05-react-v16.8.0.md

@@ -182,6 +182,7 @@ Then add it to your ESLint configuration:
 
 * Support Hooks in the shallow renderer. ([@trueadm](https://github.com/trueadm) in [#14567](https://github.com/facebook/react/pull/14567))
 * Fix wrong state in `shouldComponentUpdate` in the presence of `getDerivedStateFromProps` for Shallow Renderer. ([@chenesan](https://github.com/chenesan) in [#14613](https://github.com/facebook/react/pull/14613))
+* Add `ReactTestUtils.act()` for batching updates so that tests more closely match real behavior. ([@threepointone](https://github.com/threepointone) in [#14744](https://github.com/facebook/react/pull/14744))
 
 ### ESLint Plugin: React Hooks