Inserts extra hyphen on pre-hyphenated words

[huntiep]

I ran into a bug where if a hyphenated word is split at the hyphen an extra hypen is inserted. I've attached screenshots

Extra hyphen: Normal text:

This might be a problem with the hypher library. If you have an idea of where the issue is I can try to look at it. I'm just using the code from the bookmarklet if that matters.

Thanks for the great library!