Flask-assistant

- Dynamic fetching of google public key for google sign in
- Media responses
- initial support for Dialogflow Messenger integration

This release provides initial support for Dialogflow V2 agents.

The V1 API is no longer supported as of flask-assistant v0.3.0.

Migrating your agent and existing webhooks to V2 requires:
- Select `V2 API` under the API version section in the Dialogflow console settings
- Initialize the `Assistant` class with your Google Cloud project ID (found in the settings page) as shown below


app = Flask(__name__)
assist = Assistant(app, project_id='YOUR_PROJECT_ID')

- Provides card, list, carousel, suggest, and link_out responses
- Integrates with Google Assistant