Removed dictionary comprehension for py26 support (woo!)

Author: macro1

simple_history/models.py

@@ -174,8 +174,8 @@ def revert_url(self):
                     [getattr(self, opts.pk.attname), self.history_id])
 
         def get_instance(self):
-            return model(**{field.attname: getattr(self, field.attname)
-                            for field in fields.values()})
+            return model(**dict([(field.attname, getattr(self, field.attname))
+                                for field in fields.values()]))
 
         return {
             'history_id': models.AutoField(primary_key=True),