Compare with cargo-license and show some example output in README.

[vi]

Is it the same as cargo-license? In any case, README should be extented.

[Nemo157]

I'm not sure whether I want a comparison against cargo-license, but definitely should enhance the readme, lots of new features to highlight.

[arve0]

I'm expecting to see some output on check, like "OK", but only get the IANAL warning. Is this correct behavior?

$ cargo lichking check
warning: IANAL: This is not legal advice and is not guaranteed to be correct.
$ echo $?
0

[Nemo157]

@arve0 that's correct currently, but I think it makes sense to print something saying it was fine, opened #53 for it.