updating version number to v3.1.1

[jogomojo]

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[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 34.97%. Comparing base (3c8b05f) to head (543b4d0).
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Additional details and impacted files

@@              Coverage Diff              @@
##           image_v3.1.1    #1504   +/-   ##
=============================================
  Coverage         34.97%   34.97%           
=============================================
  Files                30       30           
  Lines              4669     4669           
  Branches            818      818           
=============================================
  Hits               1633     1633           
  Misses             2976     2976           
  Partials             60       60           

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