Remove semver breaking change (LogLevel: Clone)

src/lib.rs

@@ -66,7 +66,14 @@ pub use log::LevelFilter;
 #[derive(clap::Args, Debug, Clone, Default, PartialEq, Eq)]
 #[command(about = None, long_about = None)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
-#[cfg_attr(feature = "serde", serde(from = "LevelFilter", into = "LevelFilter"))]
+#[cfg_attr(
+    feature = "serde",
+    serde(
+        from = "LevelFilter",
+        into = "LevelFilter",
+        bound(serialize = "L: Clone")
+    )
+)]
 pub struct Verbosity<L: LogLevel = ErrorLevel> {
     #[arg(
         long,
@@ -193,7 +200,7 @@ impl<L: LogLevel> From<LevelFilter> for Verbosity<L> {
 }
 
 /// Customize the default log-level and associated help
-pub trait LogLevel: Clone {
+pub trait LogLevel {
     /// Base-line level before applying `--verbose` and `--quiet`
     fn default() -> Option<Level>;