Get rid of rustc_hex in favor of hex (#5370)

* Get rid of rustc_hex in favor of hex

* Use HexDisplay

substrate/bin/utils/subkey/Cargo.toml

@@ -16,7 +16,6 @@ sp-runtime = { version = "2.0.0-alpha.4", path = "../../../primitives/runtime" }
 rand = "0.7.2"
 clap = "2.33.0"
 tiny-bip39 = "0.7"
-rustc-hex = "2.0.1"
 substrate-bip39 = "0.4.1"
 hex = "0.4.0"
 hex-literal = "0.2.1"

substrate/bin/utils/subkey/src/main.rs

@@ -648,7 +648,7 @@ fn read_pair<C: Crypto>(
 }
 
 fn format_signature<C: Crypto>(signature: &SignatureOf<C>) -> String {
-	format!("{}", hex::encode(signature))
+	format!("{}", HexDisplay::from(&signature.as_ref()))
 }
 
 fn format_seed<C: Crypto>(seed: SeedOf<C>) -> String {
@@ -711,7 +711,7 @@ fn create_extrinsic<C: Crypto>(
 }
 
 fn print_extrinsic(extrinsic: UncheckedExtrinsic) {
-	println!("0x{}", hex::encode(&extrinsic.encode()));
+	println!("0x{}", HexDisplay::from(&extrinsic.encode()));
 }
 
 fn print_usage(matches: &ArgMatches) {