Adds extra optional argument headers

[rafaeldelboni]

Closes: #8
Related to: #7

[rafaeldelboni]

I don't know if you want me to bump version.edn file as well and sorry for any ugly code :)

[borkdude]

I don't think the test folder requires another .clj-kondo directory

[borkdude]

One problem with the string + split way of doing things on the CLI is that headers can start with colons and these would be parsed as the next option. I think coercing the headers as :edn might make more sense in this case?

[rafaeldelboni]

Sure, makes sense

[rafaeldelboni]

@borkdude could you check if my change makes sense?

[borkdude]

Looks good to me!