Let's Encrypt from scratch: A guide on how to create your own LE client

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Here is a nice guide by @alexpeattie, which describes how to create your own LE client:

A step-by-step guide to building a LE/ACME client in <150 lines of code

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Note the issue: https://github.com/alexpeattie/letsencrypt-fromscratch/issues/1

Currently, all URIs are hardcoded.