Change codegen version to 3.0.0-SNAPSHOT
Change codegen version to 3.0.0-SNAPSHOT

Signed-off-by: Joern Bernhardt <7b85a41a628204b76aba4326273a3ccc74bd009a@campudus.com>

InfoSec812/vertx-mysql-postgresql-service,InfoSec812/vertx-mysql-postgresql-service,vert-x3/vertx-mysql-postgresql-client,InfoSec812/vertx-mysql-postgresql-service,vert-x3/vertx-mysql-postgresql-client