fix: wrap fs calls with when, linting

src/commands/registration/cdup.js

@@ -2,10 +2,10 @@ const cwd = require('./cwd').handler;
 
 module.exports = {
   directive: ['CDUP', 'XCUP'],
-  handler: function(args) {
+  handler: function (args) {
     args.command._ = [args.command._[0], '..'];
     return cwd.call(this, args);
   },
   syntax: '{{cmd}}',
   description: 'Change to Parent Directory'
-}
+};