Update README

Author: mashirozx

README.md

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 # Pixiv-Nginx
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 [![GitHub release](https://img.shields.io/github/release/mashirozx/Pixiv-Nginx.svg?style=flat-square)](https://github.com/mashirozx/Pixiv-Nginx/releases/latest)
 [![Github commits (since latest release)](https://img.shields.io/github/commits-since/mashirozx/Pixiv-Nginx/latest.svg?style=flat-square)](https://github.com/mashirozx/Pixiv-Nginx/commits/)
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 使用说明见 <https://2heng.xin/2017/09/19/pixiv/>