eslint update + fixed new js lint issues

[loiane]

No description provided.

[codecov]

Codecov Report

Merging #122 into master will increase coverage by 2.08%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #122      +/-   ##
==========================================
+ Coverage   86.96%   89.04%   +2.08%     
==========================================
  Files         117      119       +2     
  Lines        1971     2647     +676     
  Branches      268      382     +114     
==========================================
+ Hits         1714     2357     +643     
- Misses        239      260      +21     
- Partials       18       30      +12

Impacted Files	Coverage Δ
...s/algorithms/dynamic-programing/min-coin-change.js	100% <ø> (ø)	⬆️
src/js/algorithms/backtracking/sudoku-solver.js	100% <ø> (ø)	⬆️
src/js/data-structures/heap.js	88.88% <ø> (-11.12%)	⬇️
src/js/data-structures/doubly-linked-list.js	100% <ø> (ø)	⬆️
src/js/data-structures/hash-table.js	90.9% <ø> (-9.1%)	⬇️
src/js/data-structures/avl-tree.js	47.05% <ø> (-6.79%)	⬇️
src/js/data-structures/set.js	100% <ø> (ø)	⬆️
...js/data-structures/hash-table-separate-chaining.js	100% <ø> (ø)	⬆️
src/js/data-structures/binary-search-tree.js	51.72% <ø> (+3.72%)	⬆️
...rc/js/data-structures/hash-table-linear-probing.js	100% <ø> (ø)	⬆️
... and 61 more

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