async function keyword (keyword) {
  const { objects } = await search('keywords:' + keyword, { size: 250 });
  return objects.map(element => element.package);
}
This is based on npm-keyword v6.1.0 by @sindresorhus,
but simplified to not have 32 needless dependencies.

- <https://github.com/sindresorhus/npm-keyword/tree/v6.1.0>
- <https://snyk.io/test/npm/npm-keyword/6.1.0?tab=dependencies>

@param {string} keyword
@return {Object[]} List of package objects