docs: update README with video tutorial notice

[NtskwK]

Summary by Sourcery

Documentation:

• 在 README 中澄清：所链接的视频教程使用的是较旧版本的 MaaFramework，用户应以文档为准。

Original summary in English

Summary by Sourcery

Documentation:

• Clarify in the README that the linked video tutorial uses an older MaaFramework version and that users should follow the documentation.

[sourcery-ai]

你好——我已经审查了你的更改，看起来非常棒！

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Original comment in English

Hey there - I've reviewed your changes and they look great!

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