Add compiler for Kotlin 1.5.20 (#2736)
Add compiler for Kotlin 1.5.20 (#2736)

* Add compiler for Kotlin 1.5.20

* Add new line at end of config file
mattgodbolt/compiler-explorer,mattgodbolt/compiler-explorer,mattgodbolt/compiler-explorer,mattgodbolt/compiler-explorer,mattgodbolt/compiler-explorer,mattgodbolt/compiler-explorer,mattgodbolt/compiler-explorer,mattgodbolt/compiler-explorer