Upgrade to Reactor 2020.0.0-RC2

Closes gh-943

Signed-off-by: Rossen Stoyanchev <[email protected]>

Author: rstoyanchev

Diff for: build.gradle

@@ -32,7 +32,7 @@ subprojects {
     apply plugin: 'io.spring.dependency-management'
     apply plugin: 'com.github.sherter.google-java-format'
 
-    ext['reactor-bom.version'] = '2020.0.0-SNAPSHOT'
+    ext['reactor-bom.version'] = '2020.0.0-RC2'
     ext['logback.version'] = '1.2.3'
     ext['netty-bom.version'] = '4.1.52.Final'
     ext['netty-boringssl.version'] = '2.0.34.Final'
@@ -95,6 +95,14 @@ subprojects {
     repositories {
         mavenCentral()
 
+        maven {
+            url 'https://repo.spring.io/milestone'
+            content {
+                includeGroup "io.projectreactor"
+                includeGroup "io.projectreactor.netty"
+            }
+        }
+
         maven {
             url 'https://repo.spring.io/snapshot'
             content {