Define date when to drop support for gpg 2.0
Upstream ends the life of gpg 2.0 on 2017-12-31. Some OS will provide it longer, though, and with some OS-versions it might even by difficult to switch to gpg 2.1.
These OS(-versions) do provide gpg 2.1:
- Debian 9
- Arch Linux
- Fedora 23 and later
- Ubuntu 16.04 and later
- FreeBSD (Ports)
- OpenBSD 5.8 and later
These (considered relevant) OS apparently only provide 2.0:
- CentOS (7 and earlier)
These OS only provide gpg2.0, but are currently not considered relevant:
- Slackware
- Mageia 5.1