async fetch({ userId }) {
    const url = `https://crates.io/api/v1/users/${userId}/stats`
    return this._requestJson({ schema: userStatsSchema, url })
  }
Fetches data from the crates.io API.

@param {object} options - The options for the request
@param {string} options.userId - The user ID.
@returns {Promise<object>} the JSON response from the API.