Remove 'serde' feature from url dependency

Author: llogiq

clippy_lints/Cargo.toml

@@ -31,9 +31,7 @@ smallvec = { version = "1", features = ["union"] }
 syn = { version = "1.0", features = ["full"] }
 toml = "0.5.3"
 unicode-normalization = "0.1"
-# cargo requires serde feat in its url dep
-# see https://github.com/rust-lang/rust/pull/63587#issuecomment-522343864
-url = { version =  "2.1.0", features = ["serde"] }
+url = "2.1.0"
 
 [features]
 debugging = []