Livestreamer: Downloading Twitch Streams Results in 400 Client Error:Bad Request

I use Livestreamer to download my own VOD files when I dun goofed and break my local recordings. This used to work perfectly, but as I write this, the software is broken due to an update in the Twitch API that enforces authentication.

error: Unable to open URL: 

https://api.twitch.tv/api/channels/havejoystick/access_token.json 

(400 Client Error: Bad Request)

There is a workaround, however; you can hand over a client specific token. Right now, this is the one used by Twitch's web player:

livestreamer --http-header Client-ID=jzkbprff40iqj646a697cyrvl0zt2m6

This works like a charm. For now.