Update to Kotlin v1.3.60

[schalkms]

Changelog:
https://github.com/JetBrains/kotlin/blob/1.3.60/ChangeLog.md

[codecov-io]

Codecov Report

Merging #2109 into master will decrease coverage by 0.06%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #2109      +/-   ##
============================================
- Coverage     80.95%   80.88%   -0.07%     
  Complexity     2020     2020              
============================================
  Files           336      336              
  Lines          5813     5813              
  Branches       1058     1064       +6     
============================================
- Hits           4706     4702       -4     
  Misses          546      546              
- Partials        561      565       +4

Impacted Files	Coverage Δ	Complexity Δ
.../arturbosch/detekt/cli/baseline/BaselineHandler.kt	72.22% <0%> (-11.12%)	12% <0%> (ø)
...n/kotlin/io/gitlab/arturbosch/detekt/rules/Junk.kt	50% <0%> (-10%)	0% <0%> (ø)
...lab/arturbosch/detekt/api/internal/PathMatchers.kt	54.54% <0%> (-9.1%)	0% <0%> (ø)
...detekt/rules/bugs/ExplicitGarbageCollectionCall.kt	66.66% <0%> (-8.34%)	7% <0%> (ø)
...b/arturbosch/detekt/api/internal/FailFastConfig.kt	36.36% <0%> (+9.09%)	5% <0%> (ø)	⬇️

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[schalkms]

It's interesting that the code coverage went down.
There might be changes in the generated code by the newest Kotlin compiler.