message: Updated README.md with anchor tag to #ChatRoom
  In an earlier PR I suggested an enhancement to the link to allow direct linking to the relevant portion of the documentation page.
  Since this pull request has been accepted (https://github.com/SeleniumHQ/seleniumhq.github.io/pull/616#event-4242829878), I can update this with the anchor tag link.
diff: @@ -58,4 +58,4 @@ If you have questions, check out [our FAQ](https://github.com/SeleniumHQ/seleniu
  You can also find us on on the [#selenium](irc://freenode.net/selenium) IRC
  channel, which is also available on
  -[Slack](https://www.selenium.dev/support/).
  +[Slack](https://www.selenium.dev/support/#ChatRoom).
  