Tests still pass back to Faraday 1.0, but not on 0.17, so I bumped the minimum Faraday version to 1.0.
Since Faraday 1.0 requires Ruby 2.3+, I also bumped acme-client's minimum Ruby to the same. I don't have a running Ruby that old, but did successfully test on Ruby 2.5.
This PR adds support for Faraday 2.x.
Tests still pass back to Faraday 1.0, but not on 0.17, so I bumped the minimum Faraday version to 1.0.
Since Faraday 1.0 requires Ruby 2.3+, I also bumped acme-client's minimum Ruby to the same. I don't have a running Ruby that old, but did successfully test on Ruby 2.5.