Update to 3.0.0. From the changelog:

- **NEW** Mob will automatically open the last modified file of the
  previous typist in your preferred IDE. Therefore, you need to set the
  configuration option `MOB_OPEN_COMMAND` to a command which opens your
  IDE. For example, the open command for IntelliJ is `idea %s`
- Add a Smiley face to Happy Collaborating message to make your day :)

(schmonz)