update Kotlin version and experimental usages of Kotlin Time

[jaforcade]

Updated to allow it to work on Kotlin 1.3.70

[luqasn]

I think a library should not use experimental features unless absolutely necessary to ensure that it works across all Kotlin versions

[jaforcade]

I mean there's versioning for a reasoning.
You can alway just use this version instead of the latest
dependencies {
implementation 'com.github.eyeem:watch-a-doin:8efeff8dd2'
}