[Kwant] Re: Dear Kwant developers

[pablo . perez . piskunow]

Hi Marc!

In version 1.4.2 it's implemented.
Check your installation with `kwant.__version__`.

See the source for details
https://gitlab.kwant-project.org/kwant/kwant/blob/v1.4.1/kwant/physics/dispersion.py#L19-161

Best,
Pablo