Make __future__ imports consistent for better compat between 2 and 3
diff --git a/asn1crypto/crl.py b/asn1crypto/crl.py
index 4d0c34a..e90ffd2 100644
--- a/asn1crypto/crl.py
+++ b/asn1crypto/crl.py
@@ -9,7 +9,7 @@
 Other type classes are defined that help compose the types listed above.
 """
 
-from __future__ import unicode_literals
+from __future__ import unicode_literals, division, absolute_import, print_function
 
 from .algos import SignedDigestAlgorithm
 from .core import (