make error Send + Sync

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "reqwest-backoff"
-version = "0.1.0"
+version = "0.1.1"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

src/lib.rs

@@ -20,7 +20,7 @@ pub enum ReqwestBackoffError {
     #[error("Reqwest error")]
     Reqwest(#[from] Error),
     #[error("Other error")]
-    Other(#[from] Box<dyn StdError>),
+    Other(#[from] Box<dyn StdError + Send + Sync>),
     #[error("Backoff error after {backoff_attempts} attempts")]
     BackoffExceeded { backoff_attempts: u32 },
 }