Added crates.io version to README.md.
Added crates.io version to README.md.

tempbottle/irc,zetok/irc,TheMightyBuzzard/irc,edunham/irc,zetok/irc,TheMightyBuzzard/irc,aatxe/irc,tempbottle/irc,edunham/irc,belak/irc