Prepare 1.15.4 release

[codecov[bot]]

Codecov Report

Merging #644 (f55433c) into master (8deb380) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #644   +/-   ##
=======================================
  Coverage   95.38%   95.38%           
=======================================
  Files          75       75           
  Lines        3252     3252           
  Branches      372      372           
=======================================
  Hits         3102     3102           
  Misses        119      119           
  Partials       31       31           

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[claudep]

Thanks Jeroen!