add version for compatibility

airflow/migrations/versions/13eb55f81627_for_compatibility.py

@@ -0,0 +1,19 @@
+"""maintain history for compatibility with earlier migrations
+
+Revision ID: 13eb55f81627
+Revises: 1507a7289a2f
+Create Date: 2015-08-23 05:12:49.732174
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '13eb55f81627'
+down_revision = '1507a7289a2f'
+branch_labels = None
+depends_on = None
+
+def upgrade():
+    pass
+
+def downgrade():
+    pass