MPP Example

Hi! I'm trying to get this plugin working with a mpp project. Here are the additions I've made to my gradle configuration to try to get this setup:
```gradle
buildscript {
repositories {
maven { url 'https://dl.bintray.com/kotlin/kotlin-dev' }
}
dependencies {
classpath "org.jetbrains.intellij.plugins:inspection-plugin:0.3.2"
}
}

apply plugin: 'org.jetbrains.intellij.inspections'

inspections {
inheritFromIdea = true
idea.version 'ideaIC:2019.1.4'
plugins.kotlin.version '1.3.50'
}
```

With this configuration, I'm not seeing any of the sourceSet-specific inspection or check tasks show up. I'm not sure what I'm doing wrong. A sample mpp project that uses this plugin would be helpful. Thanks!