* Fix wrong usages of ACMEProtocolException.
* Add changelog fragment.
* Fix error handling when content could not be decoded.
* Make sure that content_json is a dict or None.
* Improve acme_inspect's ACMEProtocolException handling.
* Improve error handling.
* Add tests.
* Fix challenge error.
* Add challenges tests.
* Provide content if available.
* Add some order tests.
* Linting.
