add tests

[moonso]

This PR cleanups test environment and adds a number of tests

It looks humongous due to the fact that the whole package is blacked.

For reviewers

The only changes to the actual code is the following:

Changes to hk code

• The --yes flag need only be used once when deleting files with the CLI. (fixes #56 )
• The store is instantiated in the base of the CLI and accessed in the same way in all subcommands
• The python-dateutil package is replaced by a function that parses date strings

Changes to tests

Almost all tests has been updated as well as the fixtures and how they are used. Test coverage is increased to ~84%

Changes to GitHub checks

The CI is now being executed by GitHub Actions instead of travis with a more slimmed config file. Code checks are done with black, flake8 and code factor .

Expected outcome: The test environment should be improved and updated

Review:

• [x] code approved by @henrikstranneheim
• [x] tests executed by GitHub Actions
• [x] "Merge and deploy" approved by @barrystokman Thanks for filling in who performed the code review and the test!

This is minor version bump because there has been minor changes in the cli.

[moonso]

Hi @henrikstranneheim , thanks for the review! I will adress the changes locally since it is very tedious to do it on GitHub, one commit for every applied change. So don't me mad if I resolver stuff, that means I have applied the changes manually 🛩️

[moonso]

Ok @barrystokman , I have adressed some stuff according to your suggestions. Thank's for the review!!

[moonso]