docs(gateway-vertx) Update Vert.x Gateway README.
docs(gateway-vertx) Update Vert.x Gateway README.

EricWittmann/apiman,EricWittmann/apiman,msavy/apiman,jcechace/apiman,apiman/apiman,apiman/apiman,msavy/apiman,msavy/apiman,apiman/apiman,msavy/apiman,jcechace/apiman,msavy/apiman,EricWittmann/apiman,EricWittmann/apiman,EricWittmann/apiman,jcechace/apiman,jcechace/apiman,apiman/apiman,apiman/apiman,jcechace/apiman