Fix copyright

backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/JSettingCodegen.kt

@@ -1,3 +1,11 @@
+/*
+ * Copyright 2020 Mamoe Technologies and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ * https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
 @file:Suppress("PRE_RELEASE_CLASS")
 
 package net.mamoe.mirai.console.codegen

backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/SettingValueUseSiteCodegen.kt

@@ -6,6 +6,7 @@
  *
  * https://github.com/mamoe/mirai/blob/master/LICENSE
  */
+
 @file:Suppress("PRE_RELEASE_CLASS")
 
 package net.mamoe.mirai.console.codegen

backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/ValueImplCodegen.kt

@@ -6,6 +6,7 @@
  *
  * https://github.com/mamoe/mirai/blob/master/LICENSE
  */
+
 @file:Suppress("PRE_RELEASE_CLASS")
 
 package net.mamoe.mirai.console.codegen

backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/ValuesCodegen.kt

@@ -6,6 +6,7 @@
  *
  * https://github.com/mamoe/mirai/blob/master/LICENSE
  */
+
 @file:Suppress("ClassName", "unused", "PRE_RELEASE_CLASS")
 
 package net.mamoe.mirai.console.codegen