Linting fails after upgrade to 1.6.0

[Feederhigh5]

After the 1.6.0 upgrade, linting is failing:

* What went wrong:
org/gradle/kotlin/dsl/ExtensionAccessorsKt.getLint(Lorg/unbrokendome/gradle/plugins/helm/dsl/HelmChart;)Lorg/unbrokendome/gradle/plugins/helm/dsl/Linting; (loaded from file:/Users/xxxxxx/.gradle/caches/jars-8/23016d840d726a9a74c53b1be22269c0/helm-publish-plugin-1.6.0.jar by VisitableURLClassLoader(ClassLoaderScopeIdentifier.Id{coreAndPlugins:settings:/Users/xxxxxx/service/buildSrc:root-project(export)})) called from class org.unbrokendome.gradle.plugins.helm.rules.LintTaskRule (loaded from file:/Users/xxxxxx/.gradle/caches/jars-8/d0975c78032baae4aa3a85074e9abe86/helm-plugin-1.6.0.jar by VisitableURLClassLoader(ClassLoaderScopeIdentifier.Id{coreAndPlugins:settings:/Users/xxxxxx/service/buildSrc:root-project(export)})).

build.gradle file:

plugins {
    id 'org.unbroken-dome.helm' version '1.6.0'
    id 'org.unbroken-dome.helm-publish' version '1.6.0'
}

repositories {
    mavenCentral()
}


helm {
    charts {
      service {
        chartName = 'test'
        sourceDir = file('helm/')
        version = '1.0.0'
      }
    }
}

Setup:

Gradle 6.8
------------------------------------------------------------
Kotlin:       1.4.20
Groovy:       2.5.12
Ant:          Apache Ant(TM) version 1.10.9 compiled on September 27 2020
JVM:          11.0.8 (Eclipse OpenJ9 openj9-0.21.0)
OS:           Mac OS X 10.16 x86_64

[tkrullmann]

Should be fixed in 1.6.1