Fix the build

src/io.rs:79:13: 79:50 error: this function takes 1 parameter but 2 parameters were supplied [E0061]
src/io.rs:79             tcp::TcpStream::connect(host[], port).map(TcpStream),
                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

This is now fixed.
Merge pull request #71 from steveklabnik/master

Fix the build