Certificate validation not used

[WesleyAC]

When I use the webmention-tools send command, I get the following warning:

/nix/store/118kk2bjf4wiwpr1vayxjjkpznj1fm8m-python3-3.8.8-env/lib/python3.8/site-packages/urllib3/connectionpool.py:981: InsecureRequestWarning: Unverified HTTPS request is being made to host 'webmention.rocks'. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings

Setting CERT_REQUIRED should be the default for the command-line tool.