Upgrade to Reactor Bismuth snapshots

This allows us to confirm 0.7.3 fixes and run tests against the latest
ahead of an upgrade to Reactor Netty 0.8 snapshots.

The fix for #231 and #240 are confirmed but unfortunately test case for

build.gradle

@@ -53,7 +53,7 @@ configure(allprojects) { project ->
 	ext.kotlinVersion        = "1.2.10"
 	ext.log4jVersion         = "2.10.0"
 	ext.nettyVersion         = "4.1.19.Final"
-	ext.reactorVersion       = "Bismuth-SR4"
+	ext.reactorVersion       = "Bismuth-BUILD-SNAPSHOT"
 	ext.rxjavaVersion        = "1.3.4"
 	ext.rxjavaAdapterVersion = "1.2.1"
 	ext.rxjava2Version       = "2.1.7"
@@ -131,7 +131,7 @@ 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 AspectJ 1.9 beta and Reactor snapshots
 	}
 
 	dependencies {

spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/RequestMappingExceptionHandlingIntegrationTests.java

@@ -77,10 +77,6 @@ public class RequestMappingExceptionHandlingIntegrationTests extends AbstractReq
 
 	@Test // SPR-16051
 	public void exceptionAfterSeveralItems() throws Exception {
-
-		// TODO: uncomment and try after https://github.com/reactor/reactor-netty/issues/231
-		Assume.assumeFalse(server instanceof ReactorHttpServer);
-
 		try {
 			performGet("/SPR-16051", new HttpHeaders(), String.class).getBody();
 			fail();