(fix): 修正徽章链接

Author: flxxyz

README.md

@@ -2,7 +2,7 @@
 
 基于websocket实时获取斗鱼弹幕
 
-<a href="https://npmcharts.com/compare/vue?minimal=true"><img src="https://img.shields.io/npm/dm/douyudm.svg?sanitize=true" alt="Downloads" /></a>
+<a href="https://npmcharts.com/compare/douyudm?minimal=true"><img src="https://img.shields.io/npm/dm/douyudm.svg?sanitize=true" alt="Downloads" /></a>
 <a href="https://www.npmjs.com/package/douyudm"><img src="https://img.shields.io/npm/v/douyudm.svg?sanitize=true" alt="Version" /></a>
 <a href="https://www.npmjs.com/package/douyudm"><img src="https://img.shields.io/npm/l/douyudm.svg?sanitize=true" alt="License" /></a>