Added DOI badge

[jesper-friis]

Description

Type of change

• Bug fix.
• New feature.
• Documentation update.
• Test update.

Checklist

This checklist can be used as a help for the reviewer.

• Is the code easy to read and understand?
• Are comments for humans to read, not computers to disregard?
• Does a new feature has an accompanying new test (in the CI or unit testing schemes)?
• Has the documentation been updated as necessary?
• Does this close the issue?
• Is the change limited to the issue?
• Are errors handled for all outcomes?
• Does the new feature provide new restrictions on dependencies, and if so is this documented?

Comments

[codecov]

Codecov Report

Merging #606 (0c992ad) into master (3190138) will decrease coverage by 0.04%.
The diff coverage is n/a.

❗ Current head 0c992ad differs from pull request most recent head 9906881. Consider uploading reports for the commit 9906881 to get more accurate results

@@            Coverage Diff             @@
##           master     #606      +/-   ##
==========================================
- Coverage   67.94%   67.91%   -0.04%     
==========================================
  Files          16       16              
  Lines        3135     3135              
==========================================
- Hits         2130     2129       -1     
- Misses       1005     1006       +1     

see 1 file with indirect coverage changes