Shopifyapi

- Revert Feature 441 Dynamic API Versioning ([495](https://github.com/Shopify/shopify_python_api/pull/495))

- Fix bug: Add the `shopify/utils` sub-package when building the source distribution ([493](https://github.com/Shopify/shopify_python_api/pull/493))

- Add support for [session tokens](https://shopify.dev/concepts/apps/building-embedded-apps-using-session-tokens) ([#479](https://github.com/Shopify/shopify_python_api/pull/479))
- Use `session_token.decode_from_header` to obtain a decoded session token from an HTTP Authorization header
- Create a `utils` sub-package with a `shop_url` utility file ([483](https://github.com/Shopify/shopify_python_api/pull/483))
- Use `shop_url.sanitize_shop_domain()` to sanitize shop names given as input
- Introduce the `ApiAccess` class to handle access scopes operations for apps
- `Session` class now store access_scopes attributes as `ApiAccess` objects
- Added support for Fulfillment.update_tracking ([432](https://github.com/Shopify/shopify_python_api/pull/432))
- Add FulfillmentEvent resource ([454](https://github.com/Shopify/shopify_python_api/pull/454))
- Fix for being unable to get the len() of a filter ([456](https://github.com/Shopify/shopify_python_api/pull/456))
- Add ApplicationCredit resource ([457](https://github.com/Shopify/shopify_python_api/pull/457))
- Add support for retrieving all orders using customer_id ([466](https://github.com/Shopify/shopify_python_api/pull/466))

- [Feature] Add support for Dynamic API Versioning. When the library is initialized, it will now make a request to
Shopify to fetch a list of the available API versions. ([441](https://github.com/Shopify/shopify_python_api/pull/441))

- [Feature] Add support for Shopify Payments resources (428)

- Release API version 2020-10
- Deprecate API version 2019-10