transaction: use absolute_import

mercurial/transaction.py

@@ -11,9 +11,15 b''
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
-from i18n import _
+from __future__ import absolute_import
+
 import errno
-import error, util
+
+from .i18n import _
+from . import (
+    error,
+    util,
+)
 
 version = 2