fix broken doc test
//! ```no_run
//! use std::net::TcpStream;
//! use twitchchat::twitch::{commands::PrivMsg, Capability, Client};
-//! use twitchchat::UserConfig;
+//! use twitchchat::{TWITCH_IRC_ADDRESS, UserConfig};
//! # fn main() {
//! // create a simple TcpStream
//! let read = TcpStream::connect(TWITCH_IRC_ADDRESS).expect("to connect");
