[mdlug] Don't panic about letsencrypt

[Carl T. Miller]

Apparently it's true that Let's Encrypt will start revoking some
certificates, it's not as bad as it might sound.  I learned about
this from bleepingcomputer.com.

<https://www.bleepingcomputer.com/news/security/lets-encrypt-is-revoking-lots-of-ssl-certificates-in-two-days/>

In a nutshell, only about 1% of their certificates need to be
replaced and they will send you email if you are affected.

c