Jale version-file

[bjarn]

Feature description:

A file which can be put in a project's root, e.g. 'jale.json' which contains various settings for the project. For example; the project requires PHP 7.3 and Elasticsearch 6. We will then switch Jale to those versions with just a quick use of jale use.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.