Update hex-literal version, simplify imports and remove unused dependencies (#2371)

substrate/core/primitives/Cargo.toml

@@ -18,7 +18,6 @@ hash-db = { version = "0.12", default-features = false }
 hash256-std-hasher = { version = "0.12", default-features = false }
 ring = { version = "0.14", optional = true }
 untrusted = { version = "0.6", optional = true }
-hex-literal = { version = "0.1", optional = true }
 base58 = { version = "0.1", optional = true }
 blake2-rfc = { version = "0.2.18", optional = true }
 schnorrkel = { version = "0.1", optional = true }
@@ -33,7 +32,7 @@ regex = {version = "1.1", optional = true }
 substrate-serializer = { path = "../serializer" }
 pretty_assertions = "0.6"
 heapsize = "0.4"
-hex-literal = "0.1"
+hex-literal = "0.2"
 rand = "0.6"
 
 [features]
@@ -57,7 +56,6 @@ std = [
 	"blake2-rfc",
 	"ring",
 	"untrusted",
-	"hex-literal",
 	"hex",
 	"base58",
 	"substrate-bip39",

substrate/core/primitives/benches/benches.rs

@@ -16,10 +16,9 @@
 #![feature(test)]
 
 extern crate test;
-use hex_literal::{hex, hex_impl};
+use hex_literal::hex;
 use substrate_primitives::hashing::{twox_128, blake2_128};
 
-
 const MAX_KEY_SIZE: u32 = 32;
 
 fn data_set() -> Vec<Vec<u8>> {

substrate/core/primitives/src/crypto.rs

@@ -410,7 +410,7 @@ pub trait Pair: Sized {
 #[cfg(test)]
 mod tests {
 	use crate::DeriveJunction;
-	use hex_literal::{hex, hex_impl};
+	use hex_literal::hex;
 	use super::*;
 
 	#[derive(Eq, PartialEq, Debug)]

substrate/core/primitives/src/ed25519.rs

@@ -490,7 +490,7 @@ impl Pair {
 #[cfg(test)]
 mod test {
 	use super::*;
-	use hex_literal::{hex, hex_impl};
+	use hex_literal::hex;
 	use crate::crypto::DEV_PHRASE;
 
 	#[test]

substrate/core/primitives/src/sr25519.rs

@@ -504,7 +504,7 @@ impl Pair {
 mod test {
 	use super::*;
 	use crate::crypto::{Ss58Codec, DEV_PHRASE, DEV_ADDRESS};
-	use hex_literal::{hex, hex_impl};
+	use hex_literal::hex;
 
 	#[test]
 	fn default_phrase_should_be_used() {