update runtime code

增加DestroyPackage()方法

Assets/YooAsset/Runtime/YooAssets.cs

@@ -99,6 +99,7 @@ namespace YooAsset
 			if (HasPackage(packageName))
 				throw new Exception($"Package {packageName} already existed !");
 
+			YooLogger.Log($"Create resource package : {packageName}");
 			ResourcePackage package = new ResourcePackage(packageName);
 			_packages.Add(package);
 			return package;
@@ -136,6 +137,21 @@ namespace YooAsset
 			return null;
 		}
 
+		/// <summary>
+		/// 销毁资源包
+		/// </summary>
+		/// <param name="package">资源包对象</param>
+		public static void DestroyPackage(string packageName)
+		{
+			ResourcePackage package = GetPackage(packageName);
+			if (package == null)
+				return;
+
+			YooLogger.Log($"Destroy resource package : {packageName}");
+			_packages.Remove(package);
+			package.DestroyPackage();
+		}
+
 		/// <summary>
 		/// 检测资源包是否存在
 		/// </summary>