Plugin attempts to import built-in type Boolean

[Martmists-GH]

Worked fine on 3.0.3, started failing after updating to 3.1.0

buildConfig {
    generator(BuildConfigKotlinGenerator())
    packageName("my.package")
    buildConfigField("Boolean", "IS_DEVELOPMENT", "$isDevelopment")
}

Generated in 3.0.3:

package my.package

object BuildConfig {
    val IS_DEVELOPMENT: Boolean = true
}

Generated in 3.1.0:

package my.package

import Boolean

object BuildConfig {
    val IS_DEVELOPMENT: Boolean = true
}