release 0.7.4

[Polkas]

• Updated export_to method examples to not use dontrun.
• Added doi in the DESCRIPTION file.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.53%. Comparing base (cbcf90d) to head (fdc8108).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #4      +/-   ##
==========================================
+ Coverage   99.42%   99.53%   +0.11%     
==========================================
  Files           8        8              
  Lines         865      865              
==========================================
+ Hits          860      861       +1     
+ Misses          5        4       -1     

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