:wrench: allow `.jsx` files to be lint-staged

[resir014]

Adds .jsx file to the list of extensions to run through lint-staged.

[codecov-io]

Codecov Report

Merging #519 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #519   +/-   ##
=======================================
  Coverage   83.25%   83.25%           
=======================================
  Files         172      172           
  Lines        5423     5423           
  Branches        1        1           
=======================================
  Hits         4515     4515           
  Misses        908      908

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[dtinth]

Thanks!!