Update how-to-cite (Closes #432)

[dweindl]

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[sonarqubecloud]

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[codecov]

Codecov Report

Merging #509 (d55da92) into develop (1156799) will increase coverage by 0.15%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #509      +/-   ##
===========================================
+ Coverage    78.27%   78.43%   +0.15%     
===========================================
  Files           23       24       +1     
  Lines         2306     2323      +17     
  Branches       549      549              
===========================================
+ Hits          1805     1822      +17     
  Misses         364      364              
  Partials       137      137              

Impacted Files	Coverage Δ
petab/__init__.py	100.00% <0.00%> (ø)

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