Update copyright year in README.md

[Sunwuyuan]

测试对于kernyr的集成。

[wuyuancat]

此拉取请求已在 Kernyr 上被提及。那里可能有相关详细信息：

http://kernyr.wuyuan.dev/t/topic/108/1

[cloudflare-workers-and-pages]

Deploying classworks with    Cloudflare Pages

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[Copilot]

Pull request overview

Updates the README’s copyright notice at the end of the document.

Changes:

• Replaces the previous bilingual (Chinese + English) copyright block with a single English line.
• Updates the year range to end at 2026 and adjusts the author name formatting.

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[Copilot]

The PR title suggests this is only a copyright-year bump, but this change also removes the Chinese copyright line and changes the author formatting ("Sun Wuyuan" -> "Sunwuyuan"). Please either (a) adjust the PR title/description to reflect the actual intent, or (b) keep the change scoped to the year update only.

[Copilot]

README currently uses both Chinese ("孙悟元") and the GitHub handle "@Sunwuyuan" elsewhere; this line uses "Sunwuyuan" and has a double-space before the name. Consider keeping the bilingual copyright line and using a consistent author name/spacing across the file (e.g., match the existing "Sun Wuyuan" or "SunWuyuan").

Suggested change

	Copyright (C) 2020-2026 Sunwuyuan.
	Copyright (C) 2020-2026 孙悟元 ([@SunWuyuan](https://github.com/Sunwuyuan)).