python 3 compatibility

Author: tushdante

test/__init__.py

@@ -20,7 +20,7 @@
 
 class TestSendGrid(unittest.TestCase):
     maxDiff = None
-    
+
     def setUp(self):
         self.sg = SendGridClient(SG_USER, SG_PWD)
 
@@ -97,7 +97,10 @@ def test_send(self):
                 "asm_group_id": 42
             }
             '''))
-        self.assertEqual(url, test_url)
+        try:
+            self.assertItemsEqual(url, test_url) #python 2
+        except AttributeError:
+            self.assertCountEqual(url, test_url)
 
     @unittest.skipUnless(sys.version_info < (3, 0), 'only for python2')
     def test__build_body_unicode(self):