Remove unneeded 0 constant (#113)

packages/util/src/hex/constants.js

@@ -1,10 +0,0 @@
-// Copyright 2017-2018 Jaco Greeff
-// This software may be modified and distributed under the terms
-// of the ISC license. See the LICENSE file for details.
-// @flow
-
-const ZEROS_256 = '0000000000000000000000000000000000000000000000000000000000000000';
-
-module.exports = {
-  ZEROS_256
-};

packages/util/src/hex/fixLength.js

@@ -5,7 +5,6 @@
 
 const hexAddPrefix = require('./addPrefix');
 const hexStripPrefix = require('./stripPrefix');
-const { ZEROS_256 } = require('./constants');
 
 /**
   @name hexFixLength
@@ -37,6 +36,6 @@ module.exports = function hexFixLength (value: string, bitLength: number = -1, w
   }
 
   return hexAddPrefix(
-    `${ZEROS_256}${hexStripPrefix(value)}`.slice(-1 * strLength)
+    `${'0'.repeat(strLength)}${hexStripPrefix(value)}`.slice(-1 * strLength)
   );
 };