Add missing .lastIndexOf method

[feross]

Node.js documentation for .lastIndexOf: https://nodejs.org/api/buffer.html#buffer_buf_lastindexof_value_byteoffset_encoding

Identical to Buffer#indexOf(), but searches the Buffer from back to front instead of front to back. Returns the starting index position of value in Buffer or -1 if the Buffer does not contain value. The value can be a String, Buffer or Number. Strings are by default interpreted as UTF8. If byteOffset is provided, will return the last match that begins at or before byteOffset.

@dcposch's PR: nodejs/node#4846

[feross]

@dcposch -- any interest in sending a PR to implement this? ;)

[dcposch]

lol k

[feross]

Yo @dcposch, no pressure, but this issue is still open if you want it 😉

[dcposch]

sure, on it

[feross]

Awesome! Fixed by #127