Update broken readme tweet banner (#132)

* fix: update dead readme banner

* Update link

Co-authored-by: Steven <steven@ceriously.com>

Author: heytulsiprasad

README.md

@@ -2,8 +2,8 @@
 
 # [Open Graph Image as a Service](https://og-image.vercel.app)
 
-<a href="https://twitter.com/vercel/status/1092587111985881088">
-    <img align="right" src="https://raw.githubusercontent.com/vercel/og-image/master/public/tweet.png" height="300" />
+<a href="https://twitter.com/vercel">
+    <img align="right" src="https://og-image.vercel.app/tweet.png" height="300" />
 </a>
 
 Serverless service that generates dynamic Open Graph images that you can embed in your `<meta>` tags.