How to deploy flask swagger server generated from swaggerhub to heroku?

#!/usr/bin/env python3
import connexion
from swagger_server import encoder

app = connexion.App(__name__, specification_dir='./swagger/')
app.app.json_encoder = encoder.JSONEncoder
app.add_api('swagger.yaml', arguments={'title': 'Docuware end point'}, pythonic_params=True)

if __name__ == '__main__':
    app.run()

web: gunicorn swagger_server.__main__:app

connexion == 2.6.0
python_dateutil == 2.6.0
setuptools >= 21.0.0
gunicorn