chore: update readme

sy-records · sy-records · commit 3b1110f64f6c · 2022-03-23T16:28:23.000+08:00
diff --git a/README.md b/README.md
@@ -124,6 +124,4 @@ This project exists thanks to all the people who contribute. [[Contribute](CONTR
 
 ## Special Thanks
 
-_Vercel_ has given us a Pro account.
-
-<a href="https://vercel.com/?utm_source=docsifyjs&utm_campaign=oss" target="_blank" title="Vercel has given us a Pro account"><img src="docs/_media/powered-by-vercel.svg" alt="Vercel"></a>
+A preview of Docsify's PR and develop branch is <a href="https://vercel.com/?utm_source=docsifyjs&utm_campaign=oss" target="_blank">powered by <img src="docs/_media/vercel_logo.svg" alt="Vercel" width="100px"></a>
diff --git a/docs/_media/vercel_logo.svg b/docs/_media/vercel_logo.svg
@@ -0,0 +1 @@
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