New Features
- add loop functions, thanks to willmcgugan ([363](https://github.com/fastai/fastcore/issues/363))
- add `walk` function ([355](https://github.com/fastai/fastcore/issues/355))
- add `globtastic` and `compile_re` ([354](https://github.com/fastai/fastcore/issues/354))
- add `exec_new` ([350](https://github.com/fastai/fastcore/issues/350))
- add `PythonKernel` ([348](https://github.com/fastai/fastcore/issues/348))
- add `flatten`
Bugs Squashed
- avoid expansion of `%` format strings in `fastcore.script` ([349](https://github.com/fastai/fastcore/issues/349))