Bump Vertx from 4.0.0.Beta1 to 4.0.0.RC2 (#299)
Bump Vertx from 4.0.0.Beta1 to 4.0.0.RC2 (#299)

Signed-off-by: Pierangelo Di Pilato <b6054fff5975a97a6b1347c22e6e7915c701af4c@gmail.com>
cloudevents/sdk-java