Async/Await in custom testEnvironment

According to the docs, a custom test environment can be setup this way:

const NodeEnvironment = require('jest-environment-node');

class CustomEnvironment extends NodeEnvironment {
  constructor(config) {
    super(config);
  }

  async setup() {
    await super.setup();
    await someSetupTasks();
    this.global.someGlobalObject = createGlobalObject();
  }

  async teardown() {
    this.global.someGlobalObject = destroyGlobalObject();
    await someTeardownTasks();
    await super.teardown();
  }

  runScript(script) {
    return super.runScript(script);
  }
}

But when I do that, I get the following errors

 FAIL  tests\user.test.js
  ● Test suite failed to run

    D:\everest\tests\env.js:8
      async setup() {
            ^^^^^

    SyntaxError: Unexpected identifier

      at node_modules/jest-runner/build/run_test.js:31:29

Code: env.js

[SimenB]

Your runtime has to support async-await (so use node 8 or newer) or you need to transpile.

PR welcome with a doc update highlighting that fact!

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