Update README

README.en.md

@@ -50,3 +50,5 @@ To make code formatting work, `clang-format` needs to be installed. [migrates/fo
 Who upgraded from a commit BEFORE [c192e8001ac81cab132ae033b39f09a094587633](https://github.com/syzoj/syzoj/commit/c192e8001ac81cab132ae033b39f09a094587633) (Mar 23, 2019) **MUST** install `redis-server` and [pygments](http://pygments.org/) on the web server. Markdown contents may be broken by switching to new renderer, [migrates/html-table-merge-cell-to-md.js](migrates/html-table-merge-cell-to-md.js) may help the migration。
 
 Who upgraded from a commit BEFORE [7b03706821c604f59fe8263286203d57d634c421](https://github.com/syzoj/syzoj/commit/7b03706821c604f59fe8263286203d57d634c421) (Mar 27, 2019) **MUST** add `RemainAfterExit=yes` to the systemd config file `syzoj-web.service`'s `[Service]` section to make sure that restart service can work properly.
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+Who upgraded from a commit BEFORE [d1d019383e5cb0c96ed2191f900970654e4055c0](https://github.com/syzoj/syzoj/commit/d1d019383e5cb0c96ed2191f900970654e4055c0) (Mar 30, 2019) **MUST** upgrade web server's Redis to at least version 5, and fill web config's `judge_token` with random key. Judge server must be upgraded together, and `daemon-config.json`'s  `ServerUrl` and `ServerToken` (= `judge_token`) must be filled. If judge and web run on different server, it's recommend to move RabbitMQ to judge server.

README.md

@@ -50,3 +50,5 @@ ALTER TABLE `user` ADD `prefer_formatted_code` TINYINT(1) NOT NULL DEFAULT 1 AFT
 从该 commit [c192e8001ac81cab132ae033b39f09a094587633](https://github.com/syzoj/syzoj/commit/c192e8001ac81cab132ae033b39f09a094587633)（2019 年 3 月 23 日）前更新的用户**必须**在网站服务器上安装 `redis-server` 与 [pygments](http://pygments.org/)。旧的 Markdown 内容可能因切换到新渲染器被破坏，[migrates/html-table-merge-cell-to-md.js](migrates/html-table-merge-cell-to-md.js) 可能对迁移有所帮助。
 
 从该 commit [7b03706821c604f59fe8263286203d57d634c421](https://github.com/syzoj/syzoj/commit/7b03706821c604f59fe8263286203d57d634c421)（2019 年 3 月 27 日）前更新的用户**必须**在其 systemd 配置文件 `syzoj-web.service` 中的 `[Service]` 中加入一行 `RemainAfterExit=yes`，以使得重启服务功能正常工作。
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+从该 commit [d1d019383e5cb0c96ed2191f900970654e4055c0](https://github.com/syzoj/syzoj/commit/d1d019383e5cb0c96ed2191f900970654e4055c0)（2019 年 3 月 30 日）前更新的用户**必须**将网站服务器上的 Redis 更新到 5 或更高版本，并填写网站配置中的 `judge_token` 为随机密钥。评测端需要被同步更新，并填写 `daemon-config.json` 中的 `ServerUrl` 和 `ServerToken`（需要与 `judge_token` 相同）。如果评测端与网站在不同的服务器上，建议迁移 RabbitMQ 到评测服务器上。