Update Cargo.toml

Author: ackintosh

Cargo.lock

@@ -3,7 +3,7 @@ name = "libp2p-upnp"
 edition.workspace = true
 rust-version.workspace = true
 description = "UPnP support for libp2p transports"
-version = "0.4.1"
+version = "0.4.2"
 license = "MIT"
 repository = "https://github.com/libp2p/rust-libp2p"
 keywords = ["peer-to-peer", "libp2p", "networking"]