Tda-api

**New Features**
* *None*

**Bug Fixes**
* Fixes an issue seen by users of `websockets==10.0` around TDA's apparently faulty implementation of [RFC 7692](https://www.rfc-editor.org/rfc/rfc7692.html#section-7.1.2.1) ([see here for details](https://github.com/aaugustin/websockets/issues/1046))

**Deprecations**
* *None*

**New Features**
* *None*

**Bug Fixes**
* 205: Uses 1971 as the default from date instead of 1900

**Deprecations**
* *None*

**New Features**
* *None*

**Bug Fixes**
* 245: The asynchronous OAuth2Client requires an asynchronous `update_token` function, but we were always passing the synchronous version, causing the async client to crash on token refresh.

**Deprecations**
* *None*

**New Features**
* *None*

**Bug Fixes**
* [Re-done because I made a mistake last time] Due to an apparent bug (https://github.com/lepture/authlib/issues/358), `httpx==0.18.2` fails to pass authorization headers. This pins us to `httpx==0.18.1` until this is clarified/resolved.

**Deprecations**
* *None*

**New Features**
* *None*

**Bug Fixes**
* Due to an apparent bug (https://github.com/lepture/authlib/issues/358), `httpx==0.18.2` fails to pass authorization headers. This pins us to `httpx==0.18.1` until this is clarified/resolved.

**Deprecations**
* *None*

**New Features**
* *None*

**Bug Fixes**
* **For real this time:** Adds forgotten `autopep8` dependency, needed for code generation introduced in `1.3.0`

**Deprecations**
* *None*