Fix PreciousStones gradle building (#4370)

Author: TPGamesNL

build.gradle

@@ -32,7 +32,6 @@ dependencies {
 	implementation group: 'org.eclipse.jdt', name: 'org.eclipse.jdt.annotation', version: '2.2.600'
 	implementation group: 'com.google.code.findbugs', name: 'findbugs', version: '3.0.1'
 	implementation group: 'com.sk89q.worldguard', name: 'worldguard-legacy', version: '7.0.0-SNAPSHOT'
-	implementation group: 'com.github.marcelo-mason', name: 'PreciousStones', version: '24e3d4bf67'
 	implementation group: 'net.milkbowl.vault', name: 'Vault', version: '1.7.1', {
 		exclude group: 'org.bstats', module: 'bstats-bukkit'
 	}