Upgrade to Spring Integration 4.2.0.RC1

Closes gh-3827

Author: wilkinsona

spring-boot-dependencies/pom.xml

@@ -131,7 +131,7 @@
 		<spring-batch.version>3.0.5.RELEASE</spring-batch.version>
 		<spring-data-releasetrain.version>Gosling-RC1</spring-data-releasetrain.version>
 		<spring-hateoas.version>0.18.0.RELEASE</spring-hateoas.version>
-		<spring-integration.version>4.2.0.M2</spring-integration.version>
+		<spring-integration.version>4.2.0.RC1</spring-integration.version>
 		<spring-loaded.version>1.2.4.RELEASE</spring-loaded.version>
 		<spring-mobile.version>1.1.5.RELEASE</spring-mobile.version>
 		<spring-plugin.version>1.2.0.RELEASE</spring-plugin.version>