Fixed command tab-completions

Author: zefir-git

src/main/java/pro/cloudnode/smp/enchantbookplus/MainCommand.java

@@ -7,7 +7,6 @@
 import org.bukkit.command.CommandSender;
 import org.bukkit.command.TabCompleter;
 import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
 
 import java.util.List;
 import java.util.Optional;
@@ -21,8 +20,10 @@ public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command
     }
 
     @Override
-    public @Nullable List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, @NotNull String @NotNull [] args) {
-        return null;
+    public @NotNull List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, @NotNull String @NotNull [] args) {
+        if (sender.hasPermission(Permissions.RELOAD))
+            return List.of("reload");
+        return List.of();
     }
 
     /**