Bump kotlin.version from 1.2.61 to 1.3.31 (#19)
Bump kotlin.version from 1.2.61 to 1.3.31 (#19)

Bumps `kotlin.version` from 1.2.61 to 1.3.31.

Updates `kotlin-stdlib` from 1.2.61 to 1.3.31
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](https://github.com/JetBrains/kotlin/compare/v1.2.61...v1.3.31)

Updates `kotlin-reflect` from 1.2.61 to 1.3.31
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](https://github.com/JetBrains/kotlin/compare/v1.2.61...v1.3.31)

Updates `kotlin-test-junit` from 1.2.61 to 1.3.31
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](https://github.com/JetBrains/kotlin/compare/v1.2.61...v1.3.31)

Updates `kotlin-maven-plugin` from 1.2.61 to 1.3.31
ClouDesire/capri,ClouDesire/capri