[FIX] rename migration floder according to the new version

base_exception/migrations/10.0.2.0.0/pre-migration.py

@@ -0,0 +1,12 @@
+# -*- coding: utf-8 -*-
+# © 2017 Akretion, Mourad EL HADJ MIMOUNE
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).
+
+from openupgradelib import openupgrade
+
+
+@openupgrade.migrate(use_env=True)
+def migrate(env, version):
+    cr = env.cr
+    openupgrade.rename_tables(cr, [('sale_exception', 'exception_rule')])
+    openupgrade.rename_models(cr, [('sale.exception', 'exception.rule')])