v0.0.8

• Add node 11.15.0, remove node 11.12.0
  for stack(s) io.buildpacks.stacks.bionic, org.cloudfoundry.stacks.cflinuxfs3
  (https://www.pivotaltracker.com/story/show/165728618)
  (https://www.pivotaltracker.com/story/show/165292190)

• Add node 12.1.0
  for stack(s) io.buildpacks.stacks.bionic, org.cloudfoundry.stacks.cflinuxfs3
  (https://www.pivotaltracker.com/story/show/165685981)
  (https://www.pivotaltracker.com/story/show/165647617)

• Remove node 6.x; Set node 10.x as default

• Add node 8.16.0, remove node 8.15.0
  for stack(s) io.buildpacks.stacks.bionic, org.cloudfoundry.stacks.cflinuxfs2, org.cloudfoundry.stacks.cflinuxfs3
  (https://www.pivotaltracker.com/story/show/165399297)