Incompatibility with pip-tools >= 4.4.0

[sei-nicolas]

Using medikit with a version of pip-tools above release 4.3.0 leads to following error stack:

ERROR_CALL_STACK.txt

And changing specifically that call leads to further and further errors. I guess there were breaking changes related among other with jazzband/pip-tools#1022

I guess a quick fix would be to change https://github.com/python-medikit/medikit/blob/master/Projectfile to use pip-tools ~=4.0,<=4.3"

[jayvdb]

Has this been fixed?

setup.py now uses pip-tools ~= 4.5.0

[jayvdb]

The tests pass with latest pip-tools.
https://build.opensuse.org/package/show/home:jayvdb:py-new/python-medikit