WIP ktlin 2.x support

Author: wakingrufus

plugin/src/test/kotlin/org/jlleitschuh/gradle/ktlint/KtLintSupportedVersionsTest.kt

@@ -174,8 +174,8 @@ class KtLintSupportedVersionsTest : AbstractPluginTest() {
     class SupportedKtlintVersionsProvider : GradleArgumentsProvider() {
         private val supportedKtlintVersions = mutableListOf(
             "1.0.1", // lowest
-            "1.5.0", // default
-            "1.8.0" // highest
+            "1.8.0", // default
+            "2.0.0-ALPHA-4" // highest
         )
 
         override fun provideArguments(