Downgrade to criterion v0.4

Signed-off-by: John Nunley <[email protected]>

Author: notgull

Cargo.toml

@@ -40,7 +40,7 @@ waker-fn = "1.1.0"
 async-channel = "1"
 async-net = "1"
 blocking = "1"
-criterion = { version = "0.5", default-features = false, features = ["cargo_bench_support"] }
+criterion = { version = "0.4", default-features = false, features = ["cargo_bench_support"] }
 getrandom = "0.2.7"
 signal-hook = "0.3"
 tempfile = "3"