Some technical gibberish:
We'll be adding an additional public key pin to the server headers in the next few weeks. This is the ground work for the next certificate renewal about in march 2018
These headers help your browser make sure its talking to the right site over SSL/TLS and you're not the victim of a MITM attack.
See here for a primer of HPKP: https://scotthelme.co.uk/hpkp-http-public-key-pinning/
Otter tax :