Bump version to 1.6.0

3 jobs from 1.6.0 in 7 minutes and 17 seconds (queued for 3 minutes and 38 seconds)
Status Job ID Name Coverage
  Build
passed #5050
autoscale-linux
linux

05:18

passed #5049
openswift xcodeselect8
osx

01:58

canceled #5048
autoscale-linux
linux

05:09