Fix repository URL for AppVeyor

For some reason, this project is not registered under `servo/rust-url` on AppVeyor.

Cargo.toml

@@ -15,7 +15,7 @@ license = "MIT/Apache-2.0"
 
 [badges]
 travis-ci = { repository = "servo/rust-url" }
-appveyor = { repository = "servo/rust-url" }
+appveyor = { repository = "Manishearth/rust-url" }
 
 [workspace]
 members = [".", "idna", "percent_encoding", "url_serde"]