Remove trailing whitespace in package.json

[NicolasCARPi]

Hello,

My editor is showing trailing whitespaces and:

So here you are, a little PR ;)

Best, ~Nico

[codecov[bot]]

Codecov Report

Merging #663 (982fa4e) into master (3682352) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #663   +/-   ##
=======================================
  Coverage   83.04%   83.04%           
=======================================
  Files         141      141           
  Lines       11445    11445           
  Branches     2106     2106           
=======================================
  Hits         9504     9504           
  Misses       1609     1609           
  Partials      332      332           

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