* Enhancements
* Added `JOSE.unsecured_signing/0` and `JOSE.unsecured_signing/1` for disabling the `"none"` algorithm due to the [unsecured signing vulnerability](https://auth0.com/blog/2015/03/31/critical-vulnerabilities-in-json-web-token-libraries/) and in relation to #10
* Added `JOSE.JWK.verify_strict/3`, `JOSE.JWS.verify_strict/3`, and `JOSE.JWT.verify_strict/3` for whitelisting which signing algorithms are allowed for verification.
* Added `JOSE.JWT.peek_payload/1` and `JOSE.JWT.peek_protected/1` for inspecting the payload and protected parts of a signature.