docs: update readme

README.md

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-# general-news-extractor-js
+# general-news-extractor
+
+启发自[kingname/GeneralNewsExtractor](https://github.com/kingname/GeneralNewsExtractor)，由 Python 移到 Node.js ，并做了一些小改动，提高准确度。
+
+## DEMO
+
+[https://general-news-extractor-demo.stayin.cn/](https://general-news-extractor-demo.stayin.cn/)
+
+## TODO
+
+- [ ] Run in browser
+
+## Thanks
+
+- [kingname/GeneralNewsExtractor](https://github.com/kingname/GeneralNewsExtractor)
+- [基于文本及符号密度的网页正文提取方法 - 中国知网](https://kns.cnki.net/KCMS/detail/detail.aspx?dbcode=CJFQ&dbname=CJFDLAST2019&filename=GWDZ201908029&v=MDY4MTRxVHJXTTFGckNVUkxPZmJ1Wm5GQ2poVXJyQklqclBkTEc0SDlqTXA0OUhiWVI4ZVgxTHV4WVM3RGgxVDM=)
+
+## License
+
+MIT © [zenghongtu](https://github.com/zenghongtu)