enable io-util for tokio
@@ -25,7 +25,7 @@ futures = { version = "0.3", optional = true, default-features = false, featu
log = { version = "0.4" }
native-tls = { version = "0.2", optional = true }
serde = { version = "1", optional = true, features = ["derive"] }
-tokio = { version = "0.2", optional = true, default-features = false, features = ["dns", "stream", "sync", "tcp", "time"] }
+tokio = { version = "0.2", optional = true, default-features = false, features = ["dns", "io-util", "stream", "sync", "tcp", "time"] }
tokio-tls = { version = "0.3", optional = true }
[dev-dependencies]
