Butler 2.1

Long time coming, the 2.1 version includes bug fixes, updated dependencies and a couple of breaking changes.
This is not a major new upgrade, rather an incremental one.

There are no new features in this release, rather the opposite.
The REST endpoint for retrieving free disk space has been removed. It was just too hard to get working on Windows, and required quite different installation depending on what OS Butler runs on.

The change from JSON to YAML as the format for config files is not a breaking change - the JSON files should still work - but you are highly recommended to switch to YAML, simply because YAML is a lot more human readable, it will thus be easier to spot typos in the config files.
Additionally, YAML supports the use of comments, which always a good thing.

Butler is now using Qlik's official Enigma.js library for its communication with the Qlik Sense engine.

Full change log available here.