message: Fix jest-worker readme with changes to exports
diff: @@ -21,7 +21,7 @@ This example covers the minimal usage:
  ### File `parent.js`
  ```javascript
  -import JestWorker from 'jest-worker';
  +import {Worker as JestWorker} from 'jest-worker';
  async function main() {
  const worker = new JestWorker(require.resolve('./Worker'));
  @@ -47,7 +47,7 @@ Since `worker_threads` are considered experimental in Node, you have to opt-in t
  ## API
  -The only exposed method is a constructor (`JestWorker`) that is initialized by passing the worker path, plus an options object.
  +The `Worker` export is a constructor that is initialized by passing the worker path, plus an options object.
  ### `workerPath: string` (required)
  @@ -153,7 +153,7 @@ This example covers the standard usage:
  ### File `parent.js`
  ```javascript
  -import JestWorker from 'jest-worker';
  +import {Worker as JestWorker} from 'jest-worker';
  async function main() {
  const myWorker = new JestWorker(require.resolve('./Worker'), {
  