fix: change kotlin dependency to provided to avoid conflicts in proje…

[achatellier]

…cts where koson is used

Otherwise, client projects are forced to exclude kotlin-stdlib-jdk8 to avoid multiple koson-stblib versions.

[codecov-io]

Codecov Report

Merging #6 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master       #6   +/-   ##
=========================================
  Coverage     95.23%   95.23%           
  Complexity       13       13           
=========================================
  Files             1        1           
  Lines            84       84           
  Branches         12       12           
=========================================
  Hits             80       80           
  Misses            2        2           
  Partials          2        2

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