Bump to 0.8.4

Codecov Report

Merging #114 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #114   +/-   ##
======================================
  Coverage    63.8%   63.8%           
======================================
  Files         156     156           
  Lines        6139    6139           
======================================
  Hits         3917    3917           
  Misses       2222    2222

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merged

mentioned in commit b0da0749