update: ethsign crate default

Author: samparsky

adapter/Cargo.toml

@@ -20,7 +20,7 @@ serde-hex = "0.1.0"
 web3 = { git = "https://github.com/tomusdrw/rust-web3" }
 eth_checksum = "0.1.1"
 ethabi = "8.0.1"
-ethsign = "0.7.1"
+ethsign = { version = "0.7.1", features = ['default'] }
 tiny-keccak = "1.5"
 ethkey = { git = "https://github.com/paritytech/parity.git" }
 sha2 = "0.8.0"