Feature request: A command to trigger update

After updating the all-contributors bot config file, I'd like to be able to issue a command to the bot to update the README. Currently, my impression is that once we change the bot config file, we'll need to trigger a re-build by adding a contributor's contribution (or something like that).

Could I sanity-check, is my impression correct, or is there another way already present to trigger an update to the README upon config file change?