Add repository link to Cargo.toml (#84)

Hi!

Nothing important here - just saw the headline for your talk at RustLab,
looked up `pavex` on crates.io and then noticed there was no link to the
repo 👍 Feel free to disregard

libs/pavex/Cargo.toml

@@ -2,6 +2,7 @@
 name = "pavex"
 version = "0.1.0"
 edition = "2021"
+repository = "https://github.com/LukeMathWalker/pavex"
 
 [dependencies]
 hyper = { version = "0.14", features = ["server", "http1", "http2", "tcp"] }
@@ -36,4 +37,4 @@ ron = "0.8"
 [dev-dependencies]
 tokio = { version = "1", features = ["macros"] }
 insta = "1.29.0"
-tracing = "0.1"
+tracing = "0.1"