Fix SWCommandUtils.createEnumMapper

SpigotCore_Main/src/de/steamwar/command/SWCommandUtils.java

@@ -247,7 +247,7 @@ public class SWCommandUtils {
 
     public static TypeMapper<Enum<?>> createEnumMapper(Class<Enum<?>> enumClass) {
         Enum<?>[] enums = enumClass.getEnumConstants();
-        List<String> strings = Arrays.stream(enums).map(Enum::name).collect(Collectors.toList());
+        List<String> strings = Arrays.stream(enums).map(Enum::name).map(String::toLowerCase).collect(Collectors.toList());
         return new TypeMapper<Enum<?>>() {
             @Override
             public Enum<?> map(CommandSender commandSender, String[] previousArguments, String s) {