Dnsrobocert

Changed
* Use `full` extra of Lexicon PyPI package to ensure all providers have their optional dependencies fulfilled.

Changed
* Update base image to Alpine 3.9
* Update Lexicon to 3.1.6 (new providers: Hover, Zilore)
* Update Certbot to 0.32.0

Added
* Ignore README file in /etc/letsencrypt/live

Changed
* Update Lexicon to 3.0.8
* Update Certbot to 0.30.0

Added
* Support new providers thanks to Lexicon update: Internet.bs, Hetzner

Changed
* Update Lexicon to 3.0.7
* Update Certbot to 0.29.1

Added
* Support new providers thanks to Lexicon update: Auto (dns provider auto-resolution), ConoHa, NFSN, Easyname, LocalZone (bind9)
* Allow to configure the DNS API connection using YAML files, thanks to the new configuration system of Lexicon 3

Changed
* Update Lexicon to 3.0.2
* Update Certbot to 0.28.0
* README.md updated to refer to YAML files, update environment variable parsing

Added
* Support new providers thanks to Lexicon update: Plesk, Inwx, Hurricane Electric

Changed
* Update Lexicon to 2.7.9