Updated Fetching pages with WebDriver (markdown)

Fetching-pages-with-WebDriver.md

@@ -43,3 +43,7 @@ The URL for the WebDriver interface is set with the `WEBDRIVER_URL` environment
 * Some kind of dom-wait-until-fully loaded or other
 * Handle failures better (better feedback so we know if its from chromedriver, or from the website)
 * Save last screenshot? _(This extends to saving an entire page screenshot, abstracting out the handler for diff-management, then supplying an image-diff handler)_
+
+## Raspberry Pi
+
+Known to work with RaspberryPi-4 Use the `seleniarm/standalone-chromium:4.0.0-20211213` `image:`