minor update of tutorial documentation

[keiyamamo]

fix #104 with link to zenodo. Also testing if citation works as intended. I will merge this without review as this is only documentation.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.75%. Comparing base (1c34f11) to head (6d31456).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #174      +/-   ##
==========================================
- Coverage   79.03%   78.75%   -0.28%     
==========================================
  Files          32       32              
  Lines        3777     3742      -35     
==========================================
- Hits         2985     2947      -38     
- Misses        792      795       +3     

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