0.0.3

New features

• Mail module refactor.
  ** Rename MailService to MailClient.
  ** Do not expose Vert.x API such as messages and results.
• Implement DisposableBean in VertxClientHttpConnector and VertxWebSocketClient.
• New Server Sent Events (SSE) example application.

Dependency upgrades

• Spring Boot 2.1.5.RELEASE > 2.1.6.RELEASE
• Vert.x 3.7.0 > 3.7.1
• SmallRye Axle clients 0.0.4 > 0.0.7