Update README.md

README.md

@@ -133,9 +133,10 @@ var lex = require('letsencrypt-express').create({
     cb(null, { options: opts, certs: certs });
   }
 });
+```
 
 
-
+```javascript
 // handles acme-challenge and redirects to https
 require('http').createServer(lex.middleware()).listen(80, function () {
   console.log("Listening for ACME http-01 challenges on", this.address());