small refactor in some sorting algorithms for better readability

[PeterShershov]

Small change to make it more readable using the spread operator.

[codecov-io]

Codecov Report

Merging #3 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master     #3   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          76     76           
  Lines        1596   1596           
  Branches      282    282           
=====================================
  Hits         1596   1596

Impacted Files	Coverage Δ
src/algorithms/sorting/shell-sort/ShellSort.js	100% <100%> (ø)	⬆️
src/algorithms/sorting/bubble-sort/BubbleSort.js	100% <100%> (ø)	⬆️
...algorithms/sorting/selection-sort/SelectionSort.js	100% <100%> (ø)	⬆️
...algorithms/sorting/insertion-sort/InsertionSort.js	100% <100%> (ø)	⬆️
src/algorithms/sorting/quick-sort/QuickSort.js	100% <100%> (ø)	⬆️

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[trekhleb]

@PeterShershov thank you for your fix! Spread operator you've used is better for readability of course.