Remove dependency on util builtin

No need just for inherits :)

Author: kirbysayshi

lib/test.js

@@ -2,7 +2,7 @@ var Stream = require('stream');
 var deepEqual = require('deep-equal');
 var defined = require('defined');
 var path = require('path');
-var inherits = require('util').inherits;
+var inherits = require('inherits');
 var EventEmitter = require('events').EventEmitter;
 
 module.exports = Test;