Replace iconv

[roccomuso]

Would be better to use a js-only implementation of iconv, like: https://github.com/ashtuchkin/iconv-lite

[Throne3d]

Not to self-advertise too hard, but this repo has been dead for a few years, and I forked it a long time ago to https://github.com/Throne3d/node-irc (irc-upd on npm). My fork already uses iconv-lite, so may serve your needs better!