Update README.md

Author: leafcoder

README.md

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+<div align="center">
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+# django-covid19
+![GitHub watchers](https://img.shields.io/github/watchers/leafcoder/django-covid19?style=social)
+![GitHub stars](https://img.shields.io/github/stars/leafcoder/django-covid19?style=social)
+![GitHub forks](https://img.shields.io/github/forks/leafcoder/django-covid19?style=social)
+
+![GitHub release (latest by date)](https://img.shields.io/github/v/release/leafcoder/django-covid19)
+![GitHub top language](https://img.shields.io/github/languages/top/leafcoder/django-covid19)
+![GitHub code size in bytes](https://img.shields.io/github/languages/code-size/leafcoder/django-covid19)
+![GitHub commit activity](https://img.shields.io/github/commit-activity/w/leafcoder/django-covid19)
+![GitHub All Releases](https://img.shields.io/github/downloads/leafcoder/django-covid19/total)
+
+</div>
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 # 接口文档
 
 点击查看 [在线接口文档](https://blog.leafcoder.cn/django-covid19/)。