option: specify format

[ilf]

Thanks for this tool!

I wonder why you hardcoded the target format as <title>.by.<author(s)>.<extension>. Why not make these variables, so people can use <author(s)> - <title> (<year>).<extension> or whatever they prefer?

Thanks.

[lanz]

I second this.

[agilecreativity]

@ilf @lanz

Sorry for the very late reply.

I don't actively working with Ruby at the moment since I found Clojure.

Happy to accept the PR.

Best,