Add support for kotlin.text.Regex

[roxspring]

• Added support for kotlin Regex class since they appear often in configuration

[codecov-io]

Codecov Report

Merging #63 into master will increase coverage by 0.3%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##             master      #63     +/-   ##
===========================================
+ Coverage     74.39%   74.69%   +0.3%     
- Complexity       46       48      +2     
===========================================
  Files            22       23      +1     
  Lines           164      166      +2     
  Branches         72       73      +1     
===========================================
+ Hits            122      124      +2     
  Misses           20       20             
  Partials         22       22

Impacted Files	Coverage Δ	Complexity Δ
...rc/main/io.github.config4k/readers/SelectReader.kt	100% <100%> (ø)	27 <0> (+1)	⬆️
src/main/io.github.config4k/readers/RegexReader.kt	100% <100%> (ø)	1 <1> (?)

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[mmorihiro]

That makes sense. Thank you.