Update changelog [skip ci]

resources/misc/changelogs/en/next.md

@@ -14,3 +14,8 @@
 - Some fields at administration panel shouldn't be sortable.
 - Add missing l10n text.
 - Fixed that model was reset after resetting skin previewing.
+
+## Removed
+
+- Removed Artisan command `php artisan key:random`.
+- Removed Artisan commands of migration for v3 to v4.

resources/misc/changelogs/zh_CN/next.md

@@ -14,3 +14,8 @@
 - 管理面板的列表中某些字段不应是可排序的
 - 补充部分缺失的语言文本
 - 重置皮肤预览后，皮肤模型也被重置的问题
+
+## 移除
+
+- 移除 Artisan 命令：`php artisan key:random`
+- 移除为 v3 迁移到 v4 而编写的 Artisan 命令