Acmev2

[komuw]

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Now,

What(What have you changed?)

• support acme version 2
• remove structlog as a dependency(we now use the stdlib logging lib)
• move the repo over to python3 from python2

Why(Why did you change it?)

• acme v2 is the future
• python3 is the future
• fix; add support for acme v2  #68
• fix; get TOS url dynamically #69
• fix; add support for python3 #24

TODO:

• on merge send a PR to https://github.com/komuw/website/blob/master/content/docs/client-options.md
  to show that sewer full integrates with acme v2 production endpoints

[komuw]

Hello @wilfriedjonker .

If you still use sewer as your letsencrypt client, would you mind testing that this branch and pull request will still work for you.

This Pull request adds support for ACME version2 and removes version 1 support.
Letsencrypt recently announced the availability of ACME v2(https://letsencrypt.org/2017/06/14/acme-v2-api.html)
And they have since created test endpoints(https://community.letsencrypt.org/t/staging-endpoint-for-acme-v2/49605)

I've also made a few other changes that I've been meaning to do for a while:

1. I've ported sewer to python3, it is now developed using python3.
2. I've also removed the logging library(structlog) that I was using in favour of the inbuilt stdlib logging library.