lintGradle not available at subproject level when plugin applied at root

[nickcotter]

I have a multimodule project - I apply the plugin as follows at the root:

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.netflix.nebula:gradle-lint-plugin:latest.release'
    }
}

allprojects {
    apply plugin: 'nebula.lint'
    gradleLint.rules += 'unused-dependency'
    gradleLint.alwaysRun = false
}

I can run lintGradle at the root, but at the subproject level only the generateGradleLintReport task is available.

[dmitriigriazin]

Seems like the reason is the same in #196

[dbolger]

Also #242