issue-685 fix: replaced "var" with "let" in fs.unlink.spec.js

[PriyankaCodes99]

Pull request for issue-685.

[codecov-io]

Codecov Report

Merging #733 into master will decrease coverage by 0.11%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #733      +/-   ##
=========================================
- Coverage   86.71%   86.6%   -0.12%     
=========================================
  Files          16      16              
  Lines        1746    1739       -7     
=========================================
- Hits         1514    1506       -8     
- Misses        232     233       +1

Impacted Files	Coverage Δ
src/filesystem/interface.js	93.29% <0%> (-0.39%)	⬇️
src/filesystem/implementation.js	83.68% <0%> (-0.05%)	⬇️
src/stats.js	100% <0%> (ø)	⬆️
src/fs-watcher.js	92.3% <0%> (ø)	⬆️
src/shell/environment.js	100% <0%> (ø)	⬆️

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[humphd]

This is looking good. Can you change all your uses of let fsPromises = util.fs().promises; and let fs = util.fs(); to use const instead of let? The variables don't change at all in their scope.

Once you do that, and push again, let me know and I'll re-review.