Merge pull request #317 from sloria/pyup-update-sqlalchemy-1.2.8-to-1.2.9

Update sqlalchemy to 1.2.9

{{cookiecutter.app_name}}/requirements/prod.txt

@@ -11,7 +11,7 @@ click>=5.0
 # Database
 Flask-SQLAlchemy==2.3.2
 psycopg2==2.7.5
-SQLAlchemy==1.2.8
+SQLAlchemy==1.2.9
 
 # Migrations
 Flask-Migrate==2.2.0