There is now a 'react' command that the bot will react to when used. When a reaction is
made on a message that the bot sent, then it will acknowledge that reaction using a
reply.
We do a `client.load_store()` to restore a previous session.
If both token and password are defined, token is preferred, since it wont create a new device for the bot. One or the other needs to be defined.
Requires https://github.com/anoadragon453/nio-template/pull/20 for the configuration change since password and access token must both be optional (but one must be given).
