language: node_js
node_js:
  - "12"
  - "11"
  - "10"
  - "9"
  - "8"
  - "7"
  - "6"
  - "5"
  - "4"

language: node_js
node_js:
  - "12"
  - "11"
  - "10"
  - "9"
  - "8"
  - "7"
  - "6"

Remove Node.js 4 and 5 from Travis CI rotation.
Remove Node.js 4 and 5 from Travis CI rotation.

The version of Mocha that we're using uses destructuring syntax now, which
doesn't work in Node 5 and earlier.

This package can still generate code for even older versions of Node, of
course, but there's not much we can do about test dependencies that have
dropped support for those versions.
