Fix automatic generation of Zenodo DOI
I have received a reply from Zenodo support:
> We are currently investigating and fixing this issue related to GitHub releases. As soon as we have solved it we will reach back to you.
After the last release of Datasets (1.8.0), the automatic generation of the Zenodo DOI failed: it appears in yellow as "Received", instead of in green as "Published".

I have contacted Zenodo support to fix this issue.

TODO:
- [x] Check with Zenodo to fix the issue
- [x] Check BibTeX entry is right
Fix automatic generation of Zenodo DOI 
 After the last release of Datasets (1.8.0), the automatic generation of the Zenodo DOI failed: it appears in yellow as "Received", instead of in green as "Published".

I have contacted Zenodo support to fix this issue.

TODO:
- [x] Check with Zenodo to fix the issue
- [x] Check BibTeX entry is right 
 I have received a reply from Zenodo support:
> We are currently investigating and fixing this issue related to GitHub releases. As soon as we have solved it we will reach back to you.