Upgrading gradle publish plugin

Author: ryanjbaxter

spring-cloud-contract-tools/spring-cloud-contract-gradle-plugin/build.gradle

@@ -6,7 +6,7 @@ buildscript {
 		gradlePluginPortal()
 	}
 	dependencies {
-		classpath 'com.gradle.publish:plugin-publish-plugin:1.3.0'
+		classpath 'com.gradle.publish:plugin-publish-plugin:2.0.0'
 	}
 }
 

spring-cloud-contract-tools/spring-cloud-contract-gradle-plugin/gradle/release.gradle

@@ -72,7 +72,7 @@ if (isReleaseToCentral) {
 	publishing {
 		publications {
 			pluginMaven(MavenPublication) {
-				groupId = project.group
+				groupId = project.group.toString()
 				artifactId = project.name
 			}
 		}