Don't use arrow function in browser test

Author: lukechilds

test/browser/types.js

@@ -2,6 +2,6 @@ var test = require('tape');
 var util = require('../../');
 
 test('util.types', function (t) {
-  t.doesNotThrow(() => require('../node/types'));
+  t.doesNotThrow(function () { return require('../node/types') });
   t.end();
 });