Upgrade versions; prepare for release

Author: garyrussell

build.gradle

@@ -55,9 +55,9 @@ ext {
 	mockitoVersion = '3.4.6'
 	rabbitmqVersion = project.hasProperty('rabbitmqVersion') ? project.rabbitmqVersion : '5.9.0'
 	rabbitmqHttpClientVersion = '3.2.0.RELEASE'
-	reactorVersion = '2020.0.0-M2'
-	springDataCommonsVersion = '2.4.0-M2'
-	springVersion = project.hasProperty('springVersion') ? project.springVersion : '5.3.0-M2'
+	reactorVersion = '2020.0.0-RC1'
+	springDataCommonsVersion = '2.4.0-RC1'
+	springVersion = project.hasProperty('springVersion') ? project.springVersion : '5.3.0-RC1'
 	springRetryVersion = '1.3.0'
 }