Update README.md

[Cuiyus]

Greptile Summary

This PR bumps the WeChat QR code image URL cache-busting query parameter from ?v=2 to ?v=3 in README.md, ensuring browsers and CDN caches serve the latest version of the QR code image. No logic, code, or configuration is affected.

• Updated wechat.png?v=2 → wechat.png?v=3 in the community contact table to force a cache refresh of the WeChat QR code.

Confidence Score: 5/5

• This PR is safe to merge — it is a single-character documentation change with no code impact.
• The change is limited to a query parameter version bump on a static image URL in the README. There are no code, logic, or configuration changes, and no risk of regressions.
• No files require special attention.

Important Files Changed

Filename	Overview
README.md	Updates the WeChat QR code image URL cache-busting query parameter from ?v=2 to ?v=3; no issues found.

Sequence Diagram

sequenceDiagram
    participant User as README Viewer
    participant CDN as Aliyun OSS CDN
    User->>CDN: GET /qrcode/wechat.png?v=3
    CDN-->>User: WeChat QR Code Image (cache-busted)
    Note over User,CDN: Version param bumped v=2 → v=3<br/>forces browsers to reload fresh image

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_{Last reviewed commit: b22285a}