chore: fix NodeEnvironment import in README.md (#8933)

packages/jest-circus/README.md

@@ -12,7 +12,7 @@ Circus is a flux-based test runner for Jest that is fast, easy to maintain, and
 Circus allows you to bind to events via an optional event handler on any [custom environment](https://jestjs.io/docs/en/configuration#testenvironment-string). See the [type definitions](https://github.com/facebook/jest/blob/master/packages/jest-circus/src/types.ts) for more information on the events and state data currently available.
 
 ```js
-import {NodeEnvironment} from 'jest-environment-node';
+import NodeEnvironment from 'jest-environment-node';
 import {Event, State} from 'jest-circus';
 
 class MyCustomEnvironment extends NodeEnvironment {