Depend on serde_core rather than serde

Use cargo package renaming to avoid changing any code.

Author: Techcable

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 * Upgrade to [slog v2.8.0].
   * Enable `nested-values` feature by default
   * Increase MSRV to 1.61 (same as slog)
+* Switch from `serde` to `serde_core`. Should reduce compile times.
 
 ### Added
 * Implement `Drain::flush` (new in [slog v2.8.0])

Cargo.toml

@@ -26,7 +26,7 @@ dynamic-keys = ["slog/dynamic-keys"]
 [dependencies]
 slog = "2.8"
 serde_json = "1"
-serde = "1"
+serde = { package = "serde_core", version = "1" }
 erased-serde = { version = "0.4", optional = true }
 time = { version = "0.3.6", features = ["formatting"] }