Fix fixed-hash (#110)

* Fix the problem that the current fixed-hash cannot be defined in constant directly

Signed-off-by: koushiro <koushiro.cqx@gmail.com>

* cargo fmt

Signed-off-by: koushiro <koushiro.cqx@gmail.com>

* Revert "cargo fmt"

This reverts commit 529720df1557f42edffe5acf1d24e2b7b4d4da32.

Signed-off-by: koushiro <koushiro.cqx@gmail.com>

fixed-hash/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "fixed-hash"
-version = "0.3.0"
+version = "0.3.1"
 authors = ["Parity Technologies <admin@parity.io>"]
 license = "MIT"
 homepage = "https://github.com/paritytech/parity-common"

fixed-hash/src/hash.rs

@@ -51,7 +51,7 @@ macro_rules! construct_fixed_hash {
 	( $(#[$attr:meta])* $visibility:vis struct $name:ident ( $n_bytes:expr ); ) => {
 		#[repr(C)]
 		$(#[$attr])*
-		$visibility struct $name ([u8; $n_bytes]);
+		$visibility struct $name (pub [u8; $n_bytes]);
 
 		impl From<[u8; $n_bytes]> for $name {
 			/// Constructs a hash type from the given bytes array of fixed length.