Vendor dependencies for 0.3.0 release

vendor/tracing-subscriber/src/prelude.rs

@@ -0,0 +1,19 @@
+//! The `tracing-subscriber` prelude.
+//!
+//! This brings into scope a number of extension traits that define methods on
+//! types defined here and in other crates.
+
+pub use crate::field::{
+    MakeExt as __tracing_subscriber_field_MakeExt,
+    RecordFields as __tracing_subscriber_field_RecordFields,
+};
+pub use crate::layer::{
+    Layer as __tracing_subscriber_Layer, SubscriberExt as __tracing_subscriber_SubscriberExt,
+};
+
+pub use crate::util::SubscriberInitExt as _;
+
+feature! {
+    #![all(feature = "fmt", feature = "std")]
+    pub use crate::fmt::writer::MakeWriterExt as _;
+}