Support graceful shutdown on "auto conn" (#66)

* remove references from `ReadVersion`

* expose `fn graceful_shutdown(self: Pin<&mut Self>)` on Connection

* support graceful shutdown on upgradeable connections

* format

* update to hyper 1.1.0

Cargo.toml

@@ -17,7 +17,7 @@ features = ["full"]
 rustdoc-args = ["--cfg", "docsrs"]
 
 [dependencies]
-hyper = "1.0.0"
+hyper = "1.1.0"
 futures-channel = "0.3"
 futures-util = { version = "0.3.16", default-features = false }
 http = "1.0"
@@ -31,7 +31,7 @@ tower-service ={ version = "0.3", optional = true }
 tower = { version = "0.4.1", optional = true, features = ["make", "util"] }
 
 [dev-dependencies]
-hyper = { version = "1.0.0", features = ["full"] }
+hyper = { version = "1.1.0", features = ["full"] }
 bytes = "1"
 http-body-util = "0.1.0"
 tokio = { version = "1", features = ["macros", "test-util"] }