bpo-29514: Make magic number test work for candidates

Lib/test/test_importlib/test_util.py

@@ -842,7 +842,7 @@ class MagicNumberTests(unittest.TestCase):
     Test release compatibility issues relating to importlib
     """
     @unittest.skipUnless(
-        sys.version_info.releaselevel in ('final', 'release'),
+        sys.version_info.releaselevel in ('candidate', 'final'),
         'only applies to candidate or final python release levels'
     )
     def test_magic_number(self):