parse_asnames() fails since stringi 1.8.1 (fallback_encoding removed)

[dfirr]

Hi, thanks for astools!

parse_asnames() fails with stringi >= 1.8.1 because fallback_encoding was removed, so the call to stri_read_lines(..., fallback_encoding = "UTF-8") now errors.

Proposed fix (UTF-8 input assumed):

• use stringi::stri_read_lines(as_fil, encoding = "UTF-8")

I've implemented this change and added a minimal test for parse_asnames() in my fork/branch. Happy to open a PR here if you'd like.