update readme

README.md

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 * Configurable seeds and coordinates in `/config/setspawn.json`
 * Coordinates are validated before overriding
 * Works with multi using the global config file
-* Versions for 1.15.2, 1.16.1, 1.16.5, and 1.17.1
 
 ## Usage
 
 * Start Minecraft to generate the local and global config files
+* If you have no config files, they will be populated with data from https://github.com/Minecraft-Java-Edition-Speedrunning/set-spawn-meta
 * You must restart MC after editing the config for changes to go through
 * The mod will only be active if you're on a seed that exists in the config
 * Spawn will only be set if the coordinates are naturally rollable