Update mailing list link

server-ce/README.md

@@ -7,7 +7,7 @@ Overleaf
 
 Keeping up to date
 ------------
-Sign up to the [mailing list](http://eepurl.com/bPWeiH) to get updates on Overleaf Releases and development
+Sign up to the [mailing list](https://mailchi.mp/overleaf.com/community-edition-and-server-pro) to get updates on Overleaf Releases and development
 
 Installation
 ------------