v6.0: F1=84.88%, 2208 training samples, geopolitical news classification fixed

fix: 修复标注原则标题乱码

docs: 更新模型描述至v5.0 (F1=76.88%, 2008 samples)

v5.0: F1=76.88%, 2008 training samples, finetuned from v4.0

Update README.md

Update README.md

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