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kotlinlang

I'm not sure if this is an issue on the Kotlin or the Gradle side, however I'm facing the issue that I cannot read the source sets of the kotlin setup. Something has changed when I upgraded to Gradle 6.0 and my gradle plugin the source sets via `project.convention.getPlugin(JavaPluginConvention::class.java.sourceSets`

Never mind, I found out that I need to put my code in a block like this:
```project.plugins.withId("kotlin") {...}```

Sounds more likely to be a issue on the Gradle side since Gradle's backward compatibility policy doesn't guarantee backwards compatiblity between major versions.