tried out jetty, seem to be unable to use `jetty-a...

# ktor

[Nikky]

tried out jetty, seem to be unable to use jetty-alpn-openjdk8-client with openjdk-8

java.lang.UnsupportedClassVersionError: org/eclipse/jetty/alpn/java/client/JDK9ClientALPNProcessor has been compiled by a more recent version of the Java Runtime (class file version 53.0), this version of the Java Runtime only recognizes class file versions up to 52.0

seems fishy