Update README.md

PolyMC seems to have been removed for the reason "PolyMC died" yet the project is still active. Requesting this be added back as it still supports gamemode even on the latest version

README.md

@@ -80,6 +80,7 @@ Other apps which can integrate with GameMode include:
 * [Lutris](https://lutris.net/) Install and play any video game easily
   * Enables GameMode for all games by default if available (must have both 32- and 64-bit GameMode libraries installed), configurable in preferences.
 * [Prism Launcher](https://prismlauncher.org/) Minecraft launcher
+* [PolyMC](https://polymc.org/) Minecraft launcher
 * [RetroArch](https://www.retroarch.com) Frontend for emulators, game engines and media players
 * [Vinegar](https://vinegarhq.org/) Roblox Player/Studio bootstrapper
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