Allow AccessTransformer opt-in from minecraft extension

Author: Jonathing

settings.gradle

@@ -39,7 +39,7 @@ dependencyResolutionManagement {
 
         // AccessTransformers Gradle Plugin
         // https://plugins.gradle.org/plugin/net.minecraftforge.accesstransformers
-        library 'accesstransformers-gradle', 'net.minecraftforge.accesstransformers', 'net.minecraftforge.accesstransformers.gradle.plugin' version '3.0.0'
+        library 'accesstransformers-gradle', 'net.minecraftforge.accesstransformers', 'net.minecraftforge.accesstransformers.gradle.plugin' version '4.0.1'
 
         library 'utils-data',     'net.minecraftforge', 'json-data-utils' version '0.2.1' // https://files.minecraftforge.net/net/minecraftforge/json-data-utils/index.html
         library 'utils-hash',     'net.minecraftforge', 'hash-utils'      version '0.1.9' // https://files.minecraftforge.net/net/minecraftforge/hash-utils/index.html