Missing dependency for rxjava-2-examples serviceproxy

[lukasjelonek]

I had problems generating the rx serviceproxy. Fixed it by including the following dependendcy:

  <dependency>
      <groupId>io.vertx</groupId>
      <artifactId>vertx-rx-java2</artifactId>
      <version>${project.version}</version>
    </dependency>

Can you add it to the repository?

[tsegismont]

@lukasjelonek would you mind to provide a pull request? Thanks!

[lukasjelonek]

Didn't have time last week and today I saw that @vietj already included it in commit 6ac99c7d91bf7f864b4ac571664ae2b373cd3087