Added unittest patches for Python 2.6
diff --git a/tests/test_x509.py b/tests/test_x509.py
index 1843196..83463eb 100644
--- a/tests/test_x509.py
+++ b/tests/test_x509.py
@@ -9,6 +9,9 @@
 from asn1crypto import x509, core, pem, util
 
 from .unittest_data import DataDecorator, data
+from ._unittest_compat import patch
+
+patch()
 
 if sys.version_info < (3,):
     byte_cls = str