Hi, could you pls add unicode support?

I have problems when I have a unicode character like '§' for example here:

*N$1lu§m5E#uT§G0n76=a!F§

the library says its weak, because the last '§' does not fall in any cardinality group (its integer representation is -72 or something negative I dont remember):

add_class_cardinality('0', '9', 0);
add_class_cardinality('a', 'z', 0);
add_class_cardinality('A', 'Z', 0);
add_class_cardinality('\0', '\x7f', 33);
add_class_cardinality('\0', '\xff', 100);

thus having cardinality 0, then entropy minus infinity and then the password is weak.

my hotfix was to add another cardinality bucket for unicode (kinda treating it like other non-numeric/non-alphabetic ASCII character):

add_class_cardinality(-127, '\0', 100);

and trimming all unicode chars to last (rightest byte).

which kinda fixes this bug, but its just hotfix if you think about it not really taking into account some national characters like 'ç' or 'ž' or any semantics at all.

Thanks!