Update README

README.en.md

@@ -38,3 +38,9 @@ Who upgraded from a commit BEFORE [84b9e2d7b51e4ed3ab426621b66cf5ae9e1e1c23](htt
 ```sql
 ALTER TABLE `problem` ADD `publicize_time` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP AFTER `type`;
 ```
+
+Who upgraded from a commit BEFORE [d8be150fc6b8c43af61c5e4aca4fc0fe0445aef3](https://github.com/syzoj/syzoj/commit/d8be150fc6b8c43af61c5e4aca4fc0fe0445aef3) (Dec 7, 2018) **MUST** perform the following SQL on the database.
+
+```sql
+ALTER TABLE `user` ADD `prefer_formatted_code` TINYINT(1) NOT NULL AFTER `public_email`;
+```

README.md

@@ -38,3 +38,9 @@ ALTER TABLE `judge_state` CHANGE `result` `result` JSON NOT NULL;
 ```sql
 ALTER TABLE `problem` ADD `publicize_time` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP AFTER `type`;
 ```
+
+从该 commit [d8be150fc6b8c43af61c5e4aca4fc0fe0445aef3](https://github.com/syzoj/syzoj/commit/d8be150fc6b8c43af61c5e4aca4fc0fe0445aef3)（2018 年 12 月 7 日）前更新的用户**必须**在其数据库上执行以下 SQL 语句。
+
+```sql
+ALTER TABLE `user` ADD `prefer_formatted_code` TINYINT(1) NOT NULL AFTER `public_email`;
+```