message: Remove Node.js 6-9 from .travis.yml, because of eslint.
diff: language: node_js
  matrix:
  include:
  + - node_js: "14"
  - node_js: "13"
  - node_js: "12"
  - node_js: "11"
  - node_js: "10"
  - - node_js: "9"
  - - node_js: "8"
  - - node_js: "7"
  - - node_js: "6"
  # Allow Travis tests to run in containers.
  sudo: false
  