Songbird: Tokio 1.0 (#36)

Migrates to the new version of tokio, requiring channel and sleep changes in a few locations. Additionally points to the in-tree v0.3 version of twilight.

examples/serenity/voice_receive/Cargo.toml

@@ -5,8 +5,9 @@ authors = ["my name <my@email.address>"]
 edition = "2018"
 
 [dependencies]
-env_logger = "~0.6"
-log = "~0.4"
+tracing = "0.1"
+tracing-subscriber = "0.2"
+tracing-futures = "0.2"
 
 [dependencies.songbird]
 path = "../../../"
@@ -17,5 +18,5 @@ git = "https://github.com/serenity-rs/serenity"
 branch = "current"
 
 [dependencies.tokio]
-version = "0.2"
-features = ["macros"]
+version = "1.0"
+features = ["macros", "rt-multi-thread"]

examples/serenity/voice_receive/src/main.rs

@@ -153,6 +153,8 @@ struct General;
 
 #[tokio::main]
 async fn main() {
+    tracing_subscriber::fmt::init();
+    
     // Configure the client with your Discord bot token in the environment.
     let token = env::var("DISCORD_TOKEN")
         .expect("Expected a token in the environment");