message: feat(lib): remove dependency on `tracing`'s `log` feature
  Closes
  BREAKING CHANGE: hyper no longer emits `log` records automatically.
  If you need hyper to integrate with a `log` logger (as opposed to `tracing`),
  you can add `tracing = { version = "0.1", features = ["log"] }` to activate them.
diff: @@ -32,7 +32,7 @@ httpdate = "0.3"
  httparse = "1.0"
  h2 = { git = "https://github.com/hyperium/h2", optional = true }
  itoa = "0.4.1"
  -tracing = { version = "0.1", default-features = false, features = ["log", "std"] }
  +tracing = { version = "0.1", default-features = false, features = ["std"] }
  pin-project = "1.0"
  tower-service = "0.3"
  tokio = { version = "0.3.4", features = ["sync", "stream"] }
  