Add some missing __future__ imports, for consistency.

saxbophone · saxbophone · commit 8a90e4f61620 · 2018-10-27T16:12:40.000+01:00
diff --git a/basest/exceptions.py b/basest/exceptions.py
@@ -1,5 +1,8 @@
 #!/usr/bin/python
 # -*- coding: utf-8 -*-
+from __future__ import (
+    absolute_import, division, print_function, unicode_literals
+)
 
 
 class InvalidSymbolTableError(ValueError):
