Changelog:
- Changed the client instantiation parameters from api_key/access_token to client_id and client_secret.
- Added oauth methods (authorization_url, exchange_code, set_access_token), you need to complete the authorization flow in order to get a token or set an access token.
- Updated the README.md reflecting the changes.
- Major fixes to create_webhook, view_webhook and delete_webhook methods.
- Minor fixes to _parse response method.
- Improved code.