fixed zeit.co link in readme (vercel#1497)

dsumer · arunoda · commit 85bcfb864e4c · 2017-03-25T01:20:56.000+05:30
diff --git a/readme.md b/readme.md
@@ -712,7 +712,7 @@ Note: we recommend putting `.next` in `.npmignore` or `.gitignore`. Otherwise, u
 
 <details>
   <summary>Is this production ready?</summary>
-  Next.js has been powering `https://zeit.co` since its inception.
+  Next.js has been powering https://zeit.co since its inception.
 
   We’re ecstatic about both the developer experience and end-user performance, so we decided to share it with the community.
 </details>
