vcr/unittest: Apply 2to3

vcr/unittest/testcase.py

@@ -1,5 +1,3 @@
-from __future__ import absolute_import, unicode_literals
-
 import inspect
 import logging
 import os

vcr/unittest/tests/test_testcase.py

@@ -1,15 +1,9 @@
-from __future__ import absolute_import, unicode_literals
-
 import os
 from unittest.mock import MagicMock as Mock
 from unittest import defaultTestLoader, TextTestRunner
+from urllib.request import urlopen
 from ..testcase import VCRTestCase
 
-try:
-    from urllib2 import urlopen
-except ImportError:
-    from urllib.request import urlopen
-
 
 def test_defaults():