Function async_imap_lite::connect_async

pub async fn connect_async<A: AsyncToSocketAddrs, ASTU>(
    addr: A, 
    tls_upgrader: ASTU, 
    debug: Option<bool>
) -> Result<AsyncClient<TcpStream, ASTU>> where
    ASTU: TlsClientUpgrader<Async<TcpStream>> + UpgraderExtRefer<Async<TcpStream>> + Unpin,
    ASTU::Output: AsyncRead + AsyncWrite + Unpin,