Make time entirely optional

[haileys]

No description provided.

[Drakulix]

Hey, thanks for the PR!

Code seems fine, but rustfmt is unhappy. Would you mind to fix this, then I can include this feature in the next release. :)

[haileys]

Thanks for such a quick reply!! I've force pushed a new commit

[Drakulix]

Now one of the tests doing the "test"-feature in isolation is unfortunately unhappy. 😬

I would also appreciate it, if you could adjust the ci.yml to run a new test for the feature you introduced in isolation.