Breaking Changes
- Change arguments of `store_attr()` and remove `store_attrs` attribute ([71](https://github.com/fastai/fastcore/pull/71))
- `store_attr`'s API has changed. `self` is now the second parameter, and is optional. Previously, if no names were passed to store,
names were taken from the `store_attrs` attribute; now, however, names are taken from the list of arguments to the current function.
New Features
- Warn if defaults passed to `typedispatch` ([73](https://github.com/fastai/fastcore/pull/73))
- Add `urlread` and `urljson` ([72](https://github.com/fastai/fastcore/pull/72))