fix: Allow spellchecking to be disabled

[codecov[bot]]

Codecov Report

Merging #248 into master will decrease coverage by 0.21%. The diff coverage is 75%.

@@            Coverage Diff             @@
##           master     #248      +/-   ##
==========================================
- Coverage   88.74%   88.52%   -0.22%     
==========================================
  Files          81       81              
  Lines        1617     1621       +4     
  Branches      208      210       +2     
==========================================
  Hits         1435     1435              
- Misses        157      160       +3     
- Partials       25       26       +1

Impacted Files	Coverage Δ
packages/botfuel-dialog/src/config.js	74.35% <ø> (ø)	:arrow_up:
packages/botfuel-dialog/src/nlus/botfuel-nlu.js	79.51% <75%> (-4.03%)	:arrow_down:

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[yangeorget]

Approved