Minor suggested improvements for users' convenience

[qleclerc]

Everything works great, just 2 minor suggested improvements to make users' lives easier:

• You have custom error catching if max_k is too large in asmodee() , would be nice to also have custom error catching for fixed_k and alpha

• The data you pass to asmodee() actually needs to follow a specific formatting, but that's not specified anywhere, again would be nice to write that somewhere (not sure where though)