Make psr/log and psr/cache hard dependencies

[sagikazarmark]

Those are light, interface packages, probably installed in most projects anyway.

[joelwurtz]

👎 Making this a hard dependancy will force user to have a log and cache implementation

[sagikazarmark]

That's not true. I meant the interface packages, not the virtual packages.

[joelwurtz]

The interface package does not require a virtual package ?

[sagikazarmark]

Nope. And that's how it should be, like on case of HTTPlug: it doesn't require the virtual packages either.

[joelwurtz]

Oh ok, sounds good to me then