Update README.md

Removing maintenance comment as we started maintaining it again.

README.md

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-⚠️ __ATTENTION:__ we are looking for people taking on maintenance for this package. Read more in [`webdriverio/selenium-standalone#813`](https://github.com/webdriverio/selenium-standalone/issues/813).
-
 Node.js Selenium Standalone [![Test](https://github.com/webdriverio/selenium-standalone/actions/workflows/test.yml/badge.svg?branch=main&event=push)](https://github.com/webdriverio/selenium-standalone/actions/workflows/test.yml) ![Supported node versions](https://img.shields.io/badge/node-12%2C%2013%2C%2014%2C%2015%2C%2016%2C%2017%2C%2018%2C%2019%2C%2020-green)
 ===========================