docs(README): adjust badge style

Author: yaolifeng0629

README.md

@@ -4,7 +4,7 @@
   <span>English | <a href="./README.zh-CN.md">中文</a></span>
 </div>
 
-<div align="center">
+<div align="center" style="margin-top: 20px;">
   <a href="https://hellogithub.com/repository/9433615761f548cf9648434c670cd85b" target="_blank"><img src="https://abroad.hellogithub.com/v1/widgets/recommend.svg?rid=9433615761f548cf9648434c670cd85b&claim_uid=249cPWvjfNmU7dp" alt="Featured｜HelloGitHub" style="width: 250px; height: 54px;" width="250" height="54" /></a>
 </div>
 

README.zh-CN.md

@@ -4,7 +4,7 @@
   <span>中文 | <a href="./README.md">English</a></span>
 </div>
 
-<div align="center">
+<div align="center" style="margin-top: 20px;">
   <a href="https://hellogithub.com/repository/9433615761f548cf9648434c670cd85b" target="_blank"><img src="https://abroad.hellogithub.com/v1/widgets/recommend.svg?rid=9433615761f548cf9648434c670cd85b&claim_uid=249cPWvjfNmU7dp" alt="Featured｜HelloGitHub" style="width: 250px; height: 54px;" width="250" height="54" /></a>
 </div>