Minor typographical fix

[jamesgeorge007]

insenstive -> insensitive
Follow up of #143

[codecov]

Codecov Report

Merging #145 into master will decrease coverage by 0.69%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master    #145     +/-   ##
========================================
- Coverage   91.89%   91.2%   -0.7%     
========================================
  Files           4       4             
  Lines         716     716             
  Branches      188     188             
========================================
- Hits          658     653      -5     
- Misses         58      63      +5

Impacted Files	Coverage Δ
lib/DirectoryWatcher.js	89.45% <ø> (-1.1%)	⬇️

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[sokra]

Thanks