- Remove max version constraint on ipywidgets dev dependency
2.3.21
Bugs Squashed
- Remove unneeded ipywidgets requirement
2.3.20
Bugs Squashed
- fixes UnboundLocalError: cannot access local variable `_TEMPLATE` where it is not associated with a value ([1413](https://github.com/fastai/nbdev/pull/1413)), thanks to [stepetal](https://github.com/stepetal)
2.3.19
Bugs Squashed
- Remove boxes since they broke ToC ([1411](https://github.com/fastai/nbdev/issues/1411))
2.3.18
New Features
- Add magic `__` symbols to `show_doc` output ([1410](https://github.com/fastai/nbdev/issues/1410)) - wrap `exports` cells in a shadowed box (like a card) ([1409](https://github.com/fastai/nbdev/pull/1409)), thanks to [hamelsmu](https://github.com/hamelsmu)