more idiomatic Rust (#27)

Author: Aloxaf

Cargo.toml

@@ -15,6 +15,7 @@ reqwest = { version = "0.12", default-features = false, features = ["blocking",
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 serial_test = "3.2.0"
+thiserror = "2.0.17"
 
 [dev-dependencies]
 chrono = "0.4.23"