make look more like real le object

lib/worker.js

@@ -4,7 +4,7 @@ module.exports.create = function (opts) {
 
 
 
-  opts.workerSniCallback = require('le-sni-auto').create({
+  opts.sni = require('le-sni-auto').create({
     notBefore: opts.notBefore || (10 * 24 * 60 * 60 * 1000)
   , notAfter: opts.notAfter || (5 * 24 * 60 * 60 * 1000)
   , getCertificates: function (domain, certs, cb) {
@@ -18,11 +18,11 @@ module.exports.create = function (opts) {
         });
       });
     }
-  }).sniCallback;
+  });
 
 
 
-  opts.httpsOptions = require('localhost.daplie.com-certificates').merge({ SNICallback: opts.workerSniCallback });
+  opts.httpsOptions = require('localhost.daplie.com-certificates').merge({ SNICallback: opts.sni.sniCallback });