[dependencies]: unify rustc-hex (#11506)

* [dependency]: unify `rustc-hex`

* [private tx]: fix upgrade to `rustc hex 2.1.0`

ethcore/wasm/run/Cargo.toml

@@ -14,7 +14,7 @@ vm = { path = "../../vm" }
 wasm = { path = "../" }
 clap = "2.24"
 env_logger = "0.5"
-rustc-hex = "1.0"
+rustc-hex = "2.1.0"
 
 [features]
 default = ["ethereum-types/std"]

ethcore/wasm/run/src/runner.rs

@@ -73,9 +73,9 @@ impl fmt::Display for Fail {
 				write!(
 					f,
 					"Expected to return result: 0x{} ({} bytes), but got 0x{} ({} bytes)",
-					expected.to_hex(),
+					expected.to_hex::<String>(),
 					expected.len(),
-					actual.to_hex(),
+					actual.to_hex::<String>(),
 					actual.len()
 				),
 
@@ -95,17 +95,17 @@ impl fmt::Display for Fail {
 				write!(
 					f,
 					"Storage key {} value mismatch, expected {}, got: {}",
-					key.as_bytes().to_vec().to_hex(),
-					expected.as_bytes().to_vec().to_hex(),
-					actual.as_bytes().to_vec().to_hex(),
+					key.as_bytes().to_hex::<String>(),
+					expected.as_bytes().to_hex::<String>(),
+					actual.as_bytes().to_hex::<String>(),
 				),
 
 			StorageMismatch { ref key, ref expected, actual: None} =>
 				write!(
 					f,
 					"No expected storage value for key {} found, expected {}",
-					key.as_bytes().to_vec().to_hex(),
-					expected.as_bytes().to_vec().to_hex(),
+					key.as_bytes().to_hex::<String>(),
+					expected.as_bytes().to_hex::<String>(),
 				),
 
 			Nonconformity(SpecNonconformity::Address) =>