Remove extra

Author: Menci

AquaMai.BepInEx/Plugin.cs

@@ -1,9 +1,7 @@
-using System;
-using System.Reflection;
+using System.Reflection;
 using AquaMai.Common;
 using BepInEx;
 using BepInEx.Logging;
-using Manager;
 
 namespace AquaMai.BepInEx;