License check for all dependencies

[jk-gan]

Let's see if we need this? https://fossa.com/

[plwai]

Can give it a try after v0.1 release

[pickfire]

Maybe can just use cargo lichking check?

[jk-gan]

@pickfire ok, will take a look at it

https://github.com/Nemo157/cargo-lichking