Upgrade to Spotless 3.13.0

Author: sbrannen

build.gradle

@@ -5,7 +5,7 @@ plugins {
 	id 'com.gradle.build-scan' version '1.13.4'
 	id 'net.nemerosa.versioning' version '2.6.1'
 	id 'com.github.ben-manes.versions' version '0.17.0' apply false
-	id 'com.diffplug.gradle.spotless' version '3.12.0' apply false
+	id 'com.diffplug.gradle.spotless' version '3.13.0' apply false
 	id 'org.ajoberstar.git-publish' version '0.4.1' apply false
 	id 'org.jetbrains.kotlin.jvm' version '1.2.41' apply false
 	id 'com.github.johnrengelman.shadow' version '2.0.4' apply false