feature request for two's compliment support

[charchiver]

I was wondering if you could add support for variable length signed numbers using two compliment. You might not want to implement this and feel free to close the issue.

[charchiver]

I just realized that the signed integer case can be handled with its own library so if you don't want to add support that's ok. There are also two other github leb128 projects that can handle signed integers. The speed you can manage with more of the library in safe rust is still stunningly fast. Thank you for all your hard work.