bump sparks requirement to 3.4.2, needed for recent fabfile changes (worker-04 repository patch, mainly; but start/stop/status commands, too).
bump sparks requirement to 3.4.2, needed for recent fabfile changes (worker-04 repository patch, mainly; but start/stop/status commands, too).

WillianPaiva/1flow,1flow/1flow,1flow/1flow,WillianPaiva/1flow,1flow/1flow,WillianPaiva/1flow,1flow/1flow,WillianPaiva/1flow,1flow/1flow,WillianPaiva/1flow