Update kotlin to 1.6.0

[petertrr]

chore(deps): update kotlin to 1.6.0

[codecov]

Codecov Report

Merging #6 (ad55521) into main (a1dc423) will increase coverage by 0.35%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main       #6      +/-   ##
============================================
+ Coverage     91.46%   91.82%   +0.35%     
+ Complexity      173      172       -1     
============================================
  Files            18       18              
  Lines          1113     1113              
  Branches        103      103              
============================================
+ Hits           1018     1022       +4     
  Misses           62       62              
+ Partials         33       29       -4     

Flag	Coverage Δ
unittests	91.82% <ø> (+0.35%)	⬆️

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Impacted Files	Coverage Δ
...github/petertrr/diffutils/text/DiffRowGenerator.kt	90.47% <0.00%> (+0.79%)	⬆️
...kotlin/io/github/petertrr/diffutils/patch/Delta.kt	59.09% <0.00%> (+4.54%)	⬆️

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