certbot, ACME TLS-SNI-01 and jessie backports

[Werner Detter <werner@aloah-from-hell.de>]

Hi,

TLS-SNI-01 validation is reaching end-of-life. It will stop working
temporarily on February 13th, 2019, and permanently on March 13th, 2019.
Any certificates issued before then will continue to work for 90 days
after their issuance date.

This also affects the certbot version in jessie backports. Is there a
plan to provide a fixed version for jessie backports also?

Thanks,
Werner