intercept = async (request, targetUrl) => {
    if (IMAGE_URL_RE.test(request.url())) {
      await request.respond({
        body: IMAGE_DATA_BUFFER,
        headers: HEADERS_STUB,
        status: 200
      });
    } else {
      request.continue();
    }
  }
INTERCEPT IMAGES
Listen to all requests. If a request matches IMAGE_URL_RE
then stub the image with data from IMAGE_STUB_URL

Use this in an onBefore script E.G.
  ```
  module.exports = async function(page, scenario) {
    require('./interceptImages')(page, scenario);
  }
  ```