Upgrade to Reactor Bismuth M3 (and JavaMail 1.6 final)

Issue: SPR-15787

Author: jhoeller

build.gradle

@@ -59,7 +59,7 @@ configure(allprojects) { project ->
 	ext.httpclientVersion      = "4.5.3"
 	ext.interceptorApiVersion  = "1.2"
 	ext.jackson2Version        = "2.9.0.pr4"
-	ext.javamailVersion        = "1.6.0-rc2"
+	ext.javamailVersion        = "1.6.0"
 	ext.jaxbVersion            = "2.2.11"
 	ext.jaxwsVersion           = "2.2.11"
 	ext.jcaVersion             = "1.7"
@@ -82,7 +82,7 @@ configure(allprojects) { project ->
 	ext.poiVersion             = "3.16"
 	ext.protobufVersion        = "3.3.1"
 	ext.quartzVersion          = "2.3.0"
-	ext.reactorVersion         = "Bismuth-BUILD-SNAPSHOT"
+	ext.reactorVersion         = "Bismuth-M3"
 	ext.romeVersion            = "1.7.3"
 	ext.rxjavaVersion          = '1.3.0'
 	ext.rxjavaAdapterVersion   = '1.2.1'