Make test_bad_status_repr work for Python 3.7

Allow a different representation for the exception.

Author: sbraz

tests/test_future/test_httplib.py

@@ -197,7 +197,7 @@ def test_bad_status_repr(self):
         if not utils.PY3:
             self.assertEqual(repr(exc), '''BadStatusLine("u\'\'",)''')
         else:
-            self.assertEqual(repr(exc), '''BadStatusLine("\'\'",)''')
+            self.assertIn(repr(exc), ('''BadStatusLine("''",)''', '''BadStatusLine("''")'''))
 
     def test_partial_reads(self):
         # if we have a length, the system knows when to close itself