Make classpath Iterable<File> #218

Fix #218
diff --git a/runners/gradle-plugin/src/main/kotlin/main.kt b/runners/gradle-plugin/src/main/kotlin/main.kt
index 37feccc..02970ae 100644
--- a/runners/gradle-plugin/src/main/kotlin/main.kt
+++ b/runners/gradle-plugin/src/main/kotlin/main.kt
@@ -82,7 +82,7 @@
     @Deprecated("Going to be removed in 0.9.16, use classpath + sourceDirs instead if kotlinTasks is not suitable for you")
     @Input var processConfigurations: List<Any?> = emptyList()
 
-    @Input var classpath: List<File> = arrayListOf()
+    @InputFiles var classpath: Iterable<File> = arrayListOf()
 
     @Input
     var includes: List<Any?> = arrayListOf()