Certsling

-------------------

* Drop Python 3.5 and 3.6 support, add Python 3.9 and 3.10.
[fschulze]

* Add option to always update with current settings without asking.
[fschulze]

* Updates for new root certificates.
[fschulze]

* Output more info for failed authorizations.
[fschulze]

------------------

* Accept return code 200 for nonce request.
[witsch]

------------------

* Switch to ACME Version 2 aka RFC 8555 protocol.
[fschulze]

* Enable ``-h`` for command line help output.
[fschulze]

* Add option to disable HTTP challenge.
[fschulze]

* Only start servers for enabled challenges.
[fschulze]

* Drop Python 3.4 support.
Python 3.5 support will end at it's EOL in September 2020.
[fschulze]

* Exit when no domain was provided.
[fschulze]

* Add ``-y`` option to automatically answer yes for any question.

------------------

* Add new ``--update`` (``-u``) option to avoid having to remember the settings
for each domain.
[fschulze]

* Ask to repeat csr and crt generation on failure.
[solidgoldbomb]

* Switch to dnspython after it merged with dnspython3.
[fschulze]

------------------

* Renamed to ``certsling``.
[fschulze]

* Use symmetric difference in ``verify_domains``. This catches problems due to
typos in domain names and some other cases.
[solidgoldbomb]

* Update list of issuer names checked in ``verify_crt``.
[solidgoldbomb (Stacey Sheldon)]

* More detailed error reporting.
[fschulze]

* Ask to agree to terms of use of letsencrypt and allow updating the registration.
[fschulze]

------------------

* Upgrade to new X3 authority.
[fschulze]