Update README.md

Author: FracturedCode

README.md

@@ -13,6 +13,7 @@ MCSlimeClusterFinder is a slime chunk cluster locator for minecraft. It finds cl
 * keyboard interrupt for pausing
 * keyboard interrupt for emergency stop (for frozen screen)
 * ability to exit the program and resume from file later
+* execution speed presets
 
 ### How to use:
 ```