Upgrade to Dependency Versions plugin 0.20.0

Author: sbrannen

build.gradle

@@ -4,7 +4,7 @@ import java.time.format.DateTimeFormatter
 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.github.ben-manes.versions' version '0.20.0' 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