Upgrade to Groovy 2.3.0-rc-1

spring-boot-dependencies/pom.xml

@@ -53,7 +53,7 @@
 		<commons-pool.version>1.6</commons-pool.version>
 		<crashub.version>1.3.0-beta14</crashub.version>
 		<gradle.version>1.6</gradle.version>
-		<groovy.version>2.2.1</groovy.version>
+		<groovy.version>2.3.0-rc-1</groovy.version>
 		<h2.version>1.3.175</h2.version>
 		<hamcrest.version>1.3</hamcrest.version>
 		<hibernate.version>4.3.1.Final</hibernate.version>