New Features
- Add `AttrDictDefault` and `extract_docstrings` ([617](https://github.com/fastai/fastcore/issues/617))
- Add `do_escape` to `to_xml` ([617](https://github.com/fastai/fastcore/issues/617))
- add markdown to doc output ([614](https://github.com/fastai/fastcore/issues/614))
- move patched methods to parent class ([612](https://github.com/fastai/fastcore/pull/612)), thanks to [comhar](https://github.com/comhar)
- add debug=True parameter to urlsend ([611](https://github.com/fastai/fastcore/pull/611)), thanks to [radam9](https://github.com/radam9)
Bugs Squashed
- fix annotations generated by py2pyi ([613](https://github.com/fastai/fastcore/pull/613)), thanks to [comhar](https://github.com/comhar)