Log Message:
py-acme py-certbot*: updated to 1.21.0

Certbot 1.21.0

Added

Certbot will generate a web.config file on Windows in the challenge path
when the webroot plugin is used, if one does not exist. This web.config file
lets IIS serve challenge files while they do not have an extension.

Changed

We changed the PGP key used to sign the packages we upload to PyPI. Going
forward, releases will be signed with one of three different keys. All of
these keys are available on major key servers and signed by our previous PGP
key. The fingerprints of these new keys are:
BF6BCFC89E90747B9A680FD7B6029E8500F7DB16
86379B4F0AF371B50CD9E5FF3402831161D1D280
20F201346BF8F3F455A73F9A780CC99432A28621

Fixed

More details about these changes can be found on our GitHub repo.