Depend on gnupg version 2.2?
@georg and me came to the conclusion that we should drop support for gnupg version 2.1, too.
- For CentOS, the schleuder-package includes a gnupg 2.2 already (according to #174 (comment 129392))
- In Debian, even the current stable-version can have version 2.2 already (via stretch-backports)
- Ubuntu has version 2.2 since 18.04, and releases before that are incompatible with Schleuder anyways due to their gpg-version < 2.1.16 (#302 (closed))
- All the development happens for version 2.2 anyway.
Please let us know about your opinion!