code: function fetchStarred(login, nextPageUrl) {
    return {
      login,
      [CALL_API]: {
        types: [STARRED_REQUEST, STARRED_SUCCESS, STARRED_FAILURE],
        endpoint: nextPageUrl,
        schema: Schemas.REPO_ARRAY
      }
    };
  }
docs: Fetches a page of starred repos by a particular user.
  Relies on the custom API middleware defined in ../middleware/api.js.