v0.0.6

• Remove buildpacks from id

• Add yarn 1.16.0, remove yarn 1.15.2
  for stack(s) org.cloudfoundry.stacks.cflinuxfs2, org.cloudfoundry.stacks.cflinuxfs3, io.buildpacks.stacks.bionic
  (https://www.pivotaltracker.com/story/show/165924485)