Upgrade alembic version not to raise StopIteration anymore

requirements.txt

-alembic==0.8.3
+alembic==0.9.6
 blinker==1.4
 Flask==0.10.1
 Flask-Login==0.3.2
@@ -13,9 +13,11 @@ Jinja2==2.8
 Mako==1.0.3
 MarkupSafe==0.23
 passlib==1.6.1
+pkg-resources==0.0.0
 psycopg2==2.7
+python-dateutil==2.8.1
 python-editor==0.4
+six==1.15.0
 SQLAlchemy==1.0.9
 Werkzeug==0.10.4
-wheel==0.26.0
 WTForms==2.0.2