Add dedicated configuration file

[kondanta]

Hi!

Thank you for your hard work and this beautiful tool. I'd like to have dedicated configuration while where jilu, or rather tera, can read the customization from. With that, we can simply redirect the jilu output into a file. Putting them into the changelog file itself causes inconvenience like, even if I can use sponge, some reason jilu still uses default configuration.

[jcgruenhage]

@kondanta while moving the config to a separate file would fix the behaviour you describe, the behaviour is a bug in parsing the config out of the Markdown comment, not a general problem with the approach.