tests: fix typo in test name

closes #2

Author: Fritz-Lium

test/index.js

@@ -1,4 +1,3 @@
-
 var assert = require('assert');
 var auth = require('..');
 
@@ -26,7 +25,7 @@ describe('auth(req)', function(){
   })
 
   describe('with malformed credentials', function(){
-    it('should return nulll', function(){
+    it('should return null', function(){
       var req = request('basic Zm9vcgo=');
       assert(null == auth(req));
     })
@@ -38,4 +37,4 @@ describe('auth(req)', function(){
       auth(req).should.eql({ name: 'foo', pass: 'bar' });
     })
   })
-})
+})