Support new ACME v2 API endpoint with wildcard certificates

[safizn]

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We introduced a public test API endpoint for the ACME v2 protocol and wildcard support on January 4, 2018. ACME v2 and wildcard support will be fully available on February 27, 2018. https://letsencrypt.org/2017/06/14/acme-v2-api.html

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[safizn]

Redbird proxy uses this library for requesting certificates - https://github.com/Daplie/node-greenlock it will need to support ACME v2 first. Doesn't seem it will support it.

This project looks promising, and almost complete - https://github.com/buschtoens/acme-v2

[safizn]

I switched to issuing wildcard certificates using Let'sEncrypt Certbort's plugin for Google DNS - https://certbot-dns-google.readthedocs.io/en/latest/ More information - https://certbot.eff.org/docs/using.html

[coolaj86]

Greenlock now supports Let's Encrypt v02 (ACME draft 11) with wildcard support.

Logically this creates a new many-to-many relationship, which works with the existing API, but not all of the plugins have been updated fr it.