Merge pull request #958 from playframework/mergify/bp/3.0.x/pr-866

[3.0.x] Use latest netty-reactive-streams version, ahc comes with outdated one (backport #866) by @mkurz

project/Dependencies.scala

@@ -40,7 +40,11 @@ object Dependencies {
 
   val cachecontrol = Seq("org.playframework" %% "cachecontrol" % "3.0.1")
 
-  val asyncHttpClient = Seq("org.asynchttpclient" % "async-http-client" % "2.12.3")
+  val asyncHttpClient = Seq(
+    ("org.asynchttpclient" % "async-http-client" % "2.12.3") // 2.12.x comes with outdated netty-reactive-streams, so we ...
+      .exclude("com.typesafe.netty", "netty-reactive-streams"), // ... exclude it and pull in ...
+    "com.typesafe.netty" % "netty-reactive-streams" % "2.0.13", // ... a newer version ourselves (ahc v3 will drop that dependency)
+  )
 
   val pekkoVersion = "1.0.3"