This updates `eslint-config-airbnb-base` and `eslint-plugin-import`.
This also addresses lint errors these updates raise, and excludes
several rules.
This also adds a minor simplification to the gendocs script.
Test: npm run lint
Test: npm run gendocs
This drops support for node v4 and v5. Neither is currently supported by
the Node.js team, nor by the `npm` CLI team, so it's hard to justify we
continue to support it.
The new minimum supported version is v6.
Fixes#873
No change to node support, this just adds a script.
This adds a script to check that we correctly configure all supported
node versions, since we need to update quite a few spots (README.md,
package.json, travis, appveyor).
Issue #873
Test: manual
