Breaking Changes
- make recursive behavior for `nbdev_build_docs` consistent with `nbdev_build_lib` ([467](https://github.com/fastai/nbdev/pull/467)), thanks to [hamelsmu](https://github.com/hamelsmu)
New Features
- Allow for a one-time only (potentially) .py -> .ipynb generation ([369](https://github.com/fastai/nbdev/issues/369))
Bugs Squashed
- Images with `attachment:` break export ([501](https://github.com/fastai/nbdev/pull/501)), thanks to [yacchin1205](https://github.com/yacchin1205)
- Docs nav doesn't work on gitlab ([488](https://github.com/fastai/nbdev/pull/488)), thanks to [tcapelle](https://github.com/tcapelle)
- clean up all instances of recursive ([470](https://github.com/fastai/nbdev/pull/470)), thanks to [hamelsmu](https://github.com/hamelsmu)
- After 'conda install -c fastai nbdev', error "`HTMLExporter` object has no attribute `template_path`" ([431](https://github.com/fastai/nbdev/issues/431))