Upgrade to slog v2.8

Implement Drain::flush and enable the `nested-values` feature by default.

Author: Techcable

.github/workflows/test.yml

@@ -30,7 +30,7 @@ jobs:
           # Minimum Supported Rust Version
           #
           # This is hardcoded and needs to be in sync with Cargo.toml and the README
-          - 1.53
+          - 1.61
 
           # Intermediate Releases (between MSRV and latest stable)
           # Be careful not to add these needlessly; they hold up CI

CHANGELOG.md

@@ -5,6 +5,15 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
+### Changed
+* Upgrade to [slog v2.8.0].
+  * Enable `nested-values` feature by default
+  * Increase MSRV to 1.61 (same as slog)
+
+### Added
+* Implement `Drain::flush` (new in [slog v2.8.0])
+
+[slog v2.8.0]: https://github.com/slog-rs/slog/releases/v2.8.0
 
 ## 2.6.0 - 2022-02-20
 ### Changed

Cargo.toml

@@ -15,24 +15,23 @@ readme = "README.md"
 # Please do not bump this unnecessarily.
 # Changing this should bump the minor version for semver (2.x for semver).
 #
-# The first version of Cargo that supports this field was in Rust 1.56.0.
-# In older releases, the field will be ignored, and Cargo will display a warning.
-rust-version = "1.53"
+# This currently matches the MSRV of slog
+rust-version = "1.61"
 
 [features]
-nested-values = ["erased-serde", "slog/nested-values"]
+default = ["nested-values"]
+nested-values = ["dep:erased-serde", "slog/nested-values"]
 dynamic-keys = ["slog/dynamic-keys"]
-default = []
 
 [dependencies]
-slog = { version = "2.1.1" }
+slog = "2.8"
 serde_json = "1"
 serde = "1"
-erased-serde = {version = "0.3", optional = true }
+erased-serde = { version = "0.4", optional = true }
 time = { version = "0.3.6", features = ["formatting"] }
 
 [dev-dependencies]
 slog-async = "2"
 
 [package.metadata.docs.rs]
-features = ["nested-values", "dynamic-keys"]
+features = ["dynamic-keys"]

src/lib.rs

@@ -251,6 +251,11 @@ where
         }
         Ok(())
     }
+
+    fn flush(&self) -> Result<(), slog::FlushError> {
+        let mut io = self.io.borrow_mut();
+        io.flush().map_err(slog::FlushError::from)
+    }
 }
 
 // }}}