NodeJS 6 is EOL

[friedbunny]

NodeJS 6.x reached its end of life on April 30, 2018. We currently specify node >= 6 compatibility in this project.

For us, this means that homebrew no longer installs it, which breaks the node-macos-release build on CircleCI:

$ #!/bin/bash -eo pipefail
brew install node@6
brew link node@6 --force --overwrite
^D��^D��Error: No available formula with the name "node@6" 
==> Searching for a previously deleted formula (in the last month)...
Warning: homebrew/core is shallow clone. To get complete history run:
  git -C "$(brew --repo homebrew/core)" fetch --unshallow

node@6 was deleted from homebrew/core in commit 995f3c8:
  node@6: delete because of EOL
  Closes https://github.com/Homebrew/homebrew-core/issues/39465.
  Signed-off-by: Chongyu Zhu <i@lembacon.com>

To show the formula before removal run:
  git -C "$(brew --repo homebrew/core)" show 995f3c8^:Formula/node@6.rb

If you still use this formula consider creating your own tap:
  https://docs.brew.sh/How-to-Create-and-Maintain-a-Tap
Exited with code 1

/cc @tmpsantos @asheemmamoowala

[stale]

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