remove unused require

src/server.js

@@ -16,7 +16,6 @@ const assert = require('assert'),
     middleware = require('./middleware'),
     routes = require('./routes/index.js'),
     safe = require('safetydance'),
-    settings = require('./settings.js'),
     users = require('./users.js'),
     util = require('util'),
     ws = require('ws');