Bugfix KList.last() which returned first()

[passsy]

No description provided.

[codecov]

Codecov Report

Merging #24 into master will increase coverage by 2.78%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #24      +/-   ##
=========================================
+ Coverage   64.52%   67.3%   +2.78%     
=========================================
  Files          25      25              
  Lines        1198    1199       +1     
=========================================
+ Hits          773     807      +34     
+ Misses        425     392      -33

Impacted Files	Coverage Δ
lib/src/extension/iterable_extension_mixin.dart	61.91% <100%> (+4.27%)	⬆️
lib/src/extension/list_extension_mixin.dart	33.8% <100%> (+15.23%)	⬆️
lib/src/collection/list_mutable.dart	72.22% <0%> (+2.77%)	⬆️

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