Unicode BOM & .aff ending "."

[layik]

Hi there,

I tried your code as of 0.5.3. It works which is great news. A couple of issues for scripts like Kurdish (RTL) from someone who is new to both Rust and the whole Hunspell specs of .aff and .dic.

1. The builder fails at least sometimes for a BOM. So when I removed it it from my .aff file, it worked fine whilst the CPP and the Python libraries work out of the box for the same data.
2. The builder is not happy when there is an affix without an ending "."? I might be totally wrong here, but was "panicking" on a rule when I changed it to have an ending "." it was happy!

Finally, would be keen to have a conversation/chat about your plans for suggestions and long-term plans of making this a "rust/superfast" alternative to the cpp library. Must end with saying please close if you think I am just being a noob here with this issue.

EDIT: I know it would be better to send a PR but I have not been able to.