Switch to Luxon?

[rallisf1]

I created a branch that uses Luxon instead of dayjs as I feel it is abandoned by this point, been waiting for v2 for ages.

Please feel free to test it out. I'll merge it into a 1.2.0 and update the readme once I get positive feedback here.

The only "breaking" change is the parsing format which has a few differences. You can lookup a table here.

My main concern is tree-shaking else I'd use momentjs as any sane person.

@treboryx @TheArctesian

[treboryx]

is the output smaller with luxon? because I know dayjs is much smaller than luxon