docs: update jest-enzyme section (facebook#2392)

since CRA now use the latest version of Jest under the hood,
`jest-enzyme` v3.2.0 is now working perfectly fine

Author: luftywiranda13

packages/react-scripts/template/README.md

@@ -1171,10 +1171,10 @@ Additionally, you might find [jest-enzyme](https://github.com/blainekasten/enzym
 expect(wrapper).toContainReact(welcome)
 ```
 
-To setup jest-enzyme with Create React App, follow the instructions for [initializing your test environment](#initializing-test-environment) to import `jest-enzyme`. **Note that currently only version 2.x is compatible with Create React App.**
+To setup jest-enzyme with Create React App, follow the instructions for [initializing your test environment](#initializing-test-environment) to import `jest-enzyme`.
 
 ```sh
-npm install --save-dev jest-enzyme@2.x
+npm install --save-dev jest-enzyme
 ```
 
 ```js