Fix SWCommandUtils.commandMap

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

@@ -75,7 +75,7 @@ class SWCommandUtils {
             commandMap = (CommandMap) commandMapField.get(Bukkit.getServer());
         } catch (NoSuchFieldException | IllegalAccessException exception) {
             Bukkit.shutdown();
-            throw new SecurityException("Oh shit. Commands cannot be register.", exception);
+            throw new SecurityException("Oh shit. Commands cannot be registered.", exception);
         }
     }