Add examples instead of {SOMETHING_HERE} in example conf.

[jtagcat]

For example, url = "{FEED_URL}" # URL address of a channel, group, user, or playlist..

A year ago, not knowing the file format as much, I would've done url = "{https://www.youtube.com/channel/UC4w1YQAJMWOz4qtxinq55LQ}". That's not right.

I'd propose to change that, and alike to include examples (of a working config): url = "https://www.youtube.com/channel/UC4w1YQAJMWOz4qtxinq55LQ"

/assign me