mochajs / mocha / 3920 / 1

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travis-ci

add @mocha/markdownlint-cli; closes #3172

- forked [markdownlint-cli](https://npm.im/markdownlint-cli) to fix a
  glob-related bug; will abandon our version if/when it's merged
- add `.markdownlint.json` config
- remove "allow trailing spaces" for Markdown in `.editorconfig`
- add to `lint` target & create `markdownlint` script in `package.json`,
  which is dumb, but we're stuck with it for now (+1 squashed commit)
Squashed commits:
[baf6387] wip

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