Driver: Replace xsalsa20poly1305 with crypto_secretbox (#198)

As of v0.9.1, `xsalsa20poly1305` has been deprecated. This is a mostly seamless replacement, as it appears to be the same crate authors / code / etc.

Co-authored-by: Kyle Simpson <kyleandrew.simpson@gmail.com>

src/driver/connection/mod.rs

@@ -20,6 +20,7 @@ use crate::{
     ws::WsStream,
     ConnectionInfo,
 };
+use crypto_secretbox::{KeyInit, XSalsa20Poly1305 as Cipher};
 use discortp::discord::{IpDiscoveryPacket, IpDiscoveryType, MutableIpDiscoveryPacket};
 use error::{Error, Result};
 use flume::Sender;
@@ -30,7 +31,6 @@ use std::{net::IpAddr, str::FromStr};
 use tokio::{net::UdpSocket, spawn, time::timeout};
 use tracing::{debug, info, instrument};
 use url::Url;
-use xsalsa20poly1305::{KeyInit, XSalsa20Poly1305 as Cipher};
 
 pub(crate) struct Connection {
     pub(crate) info: ConnectionInfo,