Lint update (early 22)

[passsy]

• Make SortedList a public API. It is exposed so it should be public. (Constructor is private anyways)
• Use isEven/isOdd

[codecov[bot]]

Codecov Report

Merging #154 (c4314bc) into master (c26758d) will not change coverage. The diff coverage is 71.42%.

@@           Coverage Diff           @@
##           master     #154   +/-   ##
=======================================
  Coverage   97.80%   97.80%           
=======================================
  Files          13       13           
  Lines         775      775           
=======================================
  Hits          758      758           
  Misses         17       17           

Impacted Files	Coverage Δ
lib/src/sorted_list.dart	95.89% <50.00%> (ø)
lib/src/iterable.dart	99.57% <100.00%> (ø)

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