percent_encoding: use regular crate layout

percent_encoding/Cargo.toml

@@ -7,10 +7,6 @@ repository = "https://github.com/servo/rust-url/"
 license = "MIT/Apache-2.0"
 edition = "2018"
 
-[lib]
-test = false
-path = "lib.rs"
-
 [features]
 default = ["std"]
 std = []