Motivation: It looks like there were some changes to jetty that causes figwheel to fail when launching.
Execution error (ArityException) at figwheel.server.jetty-websocket/async-websocket-configurator$fn$fn (jetty_websocket.clj:116).
Wrong number of args (2) passed to: ring.adapter.jetty/async-proxy-handler
Motivation: It looks like there were some changes to jetty that causes figwheel to fail when launching.
The latest version of Figwheel fixes this.