New upstream version 2.5.4

client/pom.xml

...ava/org/asynchttpclient/netty/channel/ChannelManager.java

...asynchttpclient/netty/handler/AsyncHttpClientHandler.java

...c/test/java/org/asynchttpclient/proxy/HttpsProxyTest.java

...t/src/test/java/org/asynchttpclient/test/EchoHandler.java

example/pom.xml

extras/guava/pom.xml

extras/jdeferred/pom.xml

extras/pom.xml

extras/registry/pom.xml

extras/retrofit2/pom.xml

extras/rxjava/pom.xml

extras/rxjava2/pom.xml

extras/simple/pom.xml

extras/typesafeconfig/pom.xml

netty-utils/pom.xml

pom.xml