Updated monitor service details in README.md (#990)

* Updated monitor service details in README.md

Added `Steam Gamer Server' to the monitor service list.

* Update README.md

* Update README.md

* Update README.md

README.md

@@ -23,7 +23,7 @@ VPS is sponsored by Uptime Kuma sponsors on [Open Collective](https://opencollec
 
 ## ⭐ Features
 
-* Monitoring uptime for HTTP(s) / TCP / Ping / DNS Record / Push.
+* Monitoring uptime for HTTP(s) / TCP / HTTP(s) Keyword / Ping / DNS Record / Push / Steam Game Server.
 * Fancy, Reactive, Fast UI/UX.
 * Notifications via Telegram, Discord, Gotify, Slack, Pushover, Email (SMTP), and [70+ notification services, click here for the full list](https://github.com/louislam/uptime-kuma/tree/master/src/components/notifications).
 * 20 second intervals.