release v1.6.0
release v1.6.0

jszroberto/spruce,jszroberto/spruce,thomasmmitchell/spruce,HeavyWombat/spruce,jszroberto/spruce,geofffranks/spruce,geofffranks/spruce,thomasmmitchell/spruce,HeavyWombat/spruce,thomasmmitchell/spruce,HeavyWombat/spruce,geofffranks/spruce