Change the CompleteConfig link in README from CurseForge to Modrinth

Author: TechPro424

README.md

@@ -11,7 +11,7 @@ Item Blacklist is a server-side mod to "remove" items from the game.
 
 The mod has a command-based configuration system that allows server administrators to add or remove items from the blacklist. Players will be unable to interact with blacklisted items in any way whatsoever.
 
-This mod also requires [version 2.3.1 of the CompleteConfig mod](https://www.curseforge.com/minecraft/mc-mods/completeconfig/files/4443781) to be installed in order for the configuration system to function properly.
+This mod also requires [version 2.3.1 of the CompleteConfig mod](https://modrinth.com/mod/completeconfig/version/2.3.1) to be installed in order for the configuration system to function properly.
 
 ## Credits
  - Huge shoutout to [robotkoer](https://modrinth.com/user/robotkoer) for creating and maintaining the [Fabulously Optimized](https://modrinth.com/modpack/fabulously-optimized) modpack, as it was the only way I could play Minecraft properly! Without this modpack, I would have never played MC Java, and as a result, never gotten into modding the game.