Update README

[ben9809]

This PR updates the citation for the Nature Paper #255

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.14%. Comparing base (faa4e1b) to head (558bb17).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #271   +/-   ##
=======================================
  Coverage   78.14%   78.14%           
=======================================
  Files          44       44           
  Lines         842      842           
  Branches      123      123           
=======================================
  Hits          658      658           
  Misses        134      134           
  Partials       50       50           

Flag	Coverage Δ
unittests	78.14% <ø> (ø)

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