Vendor dependencies for 0.3.0 release

vendor/tracing-subscriber/tests/registry_max_level_hint.rs

@@ -0,0 +1,11 @@
+#![cfg(all(feature = "registry", feature = "fmt"))]
+use tracing_subscriber::{filter::LevelFilter, prelude::*};
+
+#[test]
+fn registry_sets_max_level_hint() {
+    tracing_subscriber::registry()
+        .with(tracing_subscriber::fmt::layer())
+        .with(LevelFilter::DEBUG)
+        .init();
+    assert_eq!(LevelFilter::current(), LevelFilter::DEBUG);
+}