indentation fix

Author: Yulia Burykina

tests/test_number.py

@@ -77,4 +77,4 @@ def test_purchased_numbers_list(self):
 
         self.assertEqual(1, numbers.count)
         self.assertEqual(1, len(numbers.items))
-        self.assertEqual('3197010260188', numbers.items[0].number)
+        self.assertEqual('3197010260188', numbers.items[0].number)