_cacheAvatarImage = async function(pkg, packageName, force) {
  logger.info({ pkg: packageName }, "_cacheAvatarImage");
  if (pkg.owner) await cacheAvatarImageForGithubUser(pkg.owner, force);
  if (pkg.parentOwner)
    await cacheAvatarImageForGithubUser(pkg.parentOwner, force);
  if (pkg.hunter) await cacheAvatarImageForGithubUser(pkg.hunter, force);
}
Cache the avatar image url
@param {object} pkg
@param {string} packageName
@param {Boolean} force