Fix features

Author: sfackler

src/priv_io.rs

@@ -175,7 +175,7 @@ pub fn initialize_stream(params: &ConnectParams,
     let host = match params.target {
         ConnectTarget::Tcp(ref host) => host,
         #[cfg(feature = "unix_socket")]
-        ConnectTarget::Unix(_) => return Err(ConnectError::IoError(::bad_response())),
+        ConnectTarget::Unix(_) => return Err(ConnectError::Io(::bad_response())),
     };
 
     match negotiator.negotiate_ssl(host, socket) {