Fix readme path

Author: valenting

url/Cargo.toml

@@ -8,7 +8,7 @@ authors = ["The rust-url developers"]
 description = "URL library for Rust, based on the WHATWG URL Standard"
 documentation = "https://docs.rs/url"
 repository = "https://github.com/servo/rust-url"
-readme = "README.md"
+readme = "../README.md"
 keywords = ["url", "parser"]
 categories = ["parser-implementations", "web-programming", "encoding"]
 license = "MIT/Apache-2.0"