Execnb

New Features

- Add `DummyHistory` ([38](https://github.com/fastai/execnb/issues/38))

Bugs Squashed

- `CaptureShell.enable_matplotlib` does not follow its parent's interface ([42](https://github.com/fastai/execnb/issues/42))
- Specify encoding when reading file in `write_nb` ([41](https://github.com/fastai/execnb/pull/41)), thanks to [RalfG](https://github.com/RalfG)

Bugs Squashed

- `CaptureShell.shell` sets `cell.outputs` to ordinary dicts instead of `AttrDict`s ([39](https://github.com/fastai/execnb/pull/39)), thanks to [seeM](https://github.com/seeM)

New Features

- Add `DummyHistory` ([38](https://github.com/fastai/execnb/issues/38))

Bugs Squashed

- `nbdev_test` fails due to unescaped backslash in windows path ([37](https://github.com/fastai/execnb/issues/37))

New Features

- Only write file if changed in `write_nb` ([35](https://github.com/fastai/execnb/issues/35))
- faster startup with `MPLBACKEND` environment variable to lazily set matplotlib backend ([33](https://github.com/fastai/execnb/pull/33)), thanks to [seeM](https://github.com/seeM)

New Features

- Support `ipywidgets` ([24](https://github.com/fastai/execnb/issues/24))

Bugs Squashed

- Seaborn is not compatible with execnb ([27](https://github.com/fastai/execnb/issues/27))

New Features

- Remove usage of fastcore.xtras and fastcore.foundation to reduce chance of macOS fork issue ([26](https://github.com/fastai/execnb/issues/26))