Upgrade to Bismuth-SR5

Issue: SPR-16385

build.gradle

@@ -53,7 +53,7 @@ configure(allprojects) { project ->
 	ext.kotlinVersion        = "1.2.20"
 	ext.log4jVersion         = "2.10.0"
 	ext.nettyVersion         = "4.1.20.Final"
-	ext.reactorVersion       = "Bismuth-BUILD-SNAPSHOT"
+	ext.reactorVersion       = "Bismuth-SR5"
 	ext.rxjavaVersion        = "1.3.4"
 	ext.rxjavaAdapterVersion = "1.2.1"
 	ext.rxjava2Version       = "2.1.8"
@@ -132,7 +132,6 @@ configure(allprojects) { project ->
 	repositories {
 		maven { url "https://repo.spring.io/libs-release" }
 		maven { url "https://repo.spring.io/milestone" }  // for AspectJ 1.9 beta
-		maven { url "https://repo.spring.io/snapshot" }   // for Reactor snapshots
 	}
 
 	dependencies {