Borgmatic

* 15: Support for running multiple config files in /etc/borgmatic.d/ from a single borgmatic run.
* Fix for generate-borgmatic-config writing config with invalid one_file_system value.

* 33: Fix for passing check_last as integer to subprocess when calling Borg.

* Part of 33: Fix for upgrade-borgmatic-config converting check_last option as a string instead of
an integer.
* Fix for upgrade-borgmatic-config erroring when consistency checks option is not present.

* Switched config file format to YAML. Run upgrade-borgmatic-config to upgrade.
* Added generate-borgmatic-config command for initial config creation.
* Dropped Python 2 support. Now Python 3 only.
* 19: Fix for README mention of sample files not included in package.
* 23: Sample files for triggering borgmatic from a systemd timer.
* Support for backing up to multiple repositories.
* To free up space, now pruning backups prior to creating a new backup.
* Enabled test coverage output during tox runs.
* Added logo.

* 22: Fix for verbosity flag not actually causing verbose output.

* 21: Fix for traceback when remote_path option is missing.