cross-ci/.eslintrc.json

`cross-ci` standardizes environment variables for CI. For example, your can simply use `BUILD_BRANCH` variable in all CI runners instead of `CIRCLE_BRANCH` in CircleCI or `TRAVIS_PULL_REQUEST_BRANCH` in Travis.

{
    "extends": "mailonline",
    "rules": {
        "import/no-commonjs": "off",
        "import/unambiguous": "off",
        "indent": ["error", 4],
        "spaced-comment": "off",
        "filenames/match-regex": "off",
        "global-require": "off",
        "lines-around-comment": "off",
        "no-process-env": "off",
        "no-confusing-arrow": "off",
        "operator-linebreak": "off",
        "comma-dangle": "off",
        "id-match": "off",
        "sort-keys": "off",
        "no-void": "off",
        "no-extra-parens": "off",
        "arrow-parens": "off",
        "quotes": "off",
        "unicorn/no-array-instanceof": "off",
        "no-inline-comments": "off",
        "line-comment-position": "off"
    }
}