update version

Author: sonus21

build.gradle

@@ -83,7 +83,7 @@ ext {
 
 subprojects {
     group = "com.github.sonus21"
-    version = "4.0.0-RC1"
+    version = "4.0.0-RC2"
 
     dependencies {
         // https://mvnrepository.com/artifact/org.springframework/spring-messaging