Pin vresutils version to 0.3.1

[coroa]

That pypsa-eur is refering to the git version of vresutils is blocking FRESNA/vresutils#14 (review)

[fneum]

If I understand correctly, there should also be a new (minor) PyPSA-Eur release since https://github.com/PyPSA/pypsa-eur/releases/tag/v0.1.0 also refers to vresutils@master, right?

Should do this after PyPSA 0.17.0 release soon.

[fneum]

And sorry for the delay. The mention in FRESNA/vresutils#14 slipped through.

[coroa]

If I understand correctly, there should also be a new (minor) PyPSA-Eur release since https://github.com/PyPSA/pypsa-eur/releases/tag/v0.1.0 also refers to vresutils@master, right?

Correct

[fneum]

This is pinned to vresutils==0.3.1 in latest release https://github.com/PyPSA/pypsa-eur/tree/v0.2.0