Update data flow UI to 2.4.0.M1

Author: ilayaperumalg

pom.xml

@@ -59,7 +59,7 @@
 		<java.version>1.8</java.version>
 		<javadoc.opts>-Xdoclint:none</javadoc.opts>
 
-		<spring-cloud-dataflow-ui.version>2.4.0.BUILD-SNAPSHOT</spring-cloud-dataflow-ui.version>
+		<spring-cloud-dataflow-ui.version>2.4.0.M1</spring-cloud-dataflow-ui.version>
 
 		<spring-cloud-deployer.version>2.2.0.M1</spring-cloud-deployer.version>
 		<spring-cloud-deployer-local.version>2.2.0.M1</spring-cloud-deployer-local.version>