Enable Serde for re-exported Url (#110)

Author: phated

Cargo.toml

@@ -28,7 +28,7 @@ reqwest-0-10 = { version = "0.10", optional = true, features = ["blocking", "rus
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 sha2 = "0.9"
-url = "2.1"
+url = { version = "2.1", features = ["serde"] }
 
 [dev-dependencies]
 hex = "0.4"