Release 0.0.2

CHANGES:

- Fix how we compute the signature (@dinosaure, [#3](https://git.robur.coop/robur/jws/pulls/3))
- Improve README.md and add lower bounds (@hannesm, [#2](https://git.robur.coop/robur/jws/pulls/2))

Release 0.0.1

CHANGES:

- First release