Replace util.inherits with inherits module

Author: Lars-Magnus Skog

index.js

@@ -5,7 +5,7 @@
 module.exports = Level
 
 var AbstractLevelDOWN = require('abstract-leveldown').AbstractLevelDOWN
-var util = require('util')
+var inherits = require('inherits')
 var Iterator = require('./iterator')
 var mixedToBuffer = require('./util/mixed-to-buffer')
 var isDataCloneError = require('./util/is-data-clone-error')
@@ -23,7 +23,7 @@ function Level (location, opts) {
   this.version = parseInt(opts.version || 1, 10)
 }
 
-util.inherits(Level, AbstractLevelDOWN)
+inherits(Level, AbstractLevelDOWN)
 
 // Detect binary and array key support (IndexedDB Second Edition)
 Level.binaryKeys = support.binaryKeys(indexedDB)

iterator.js

@@ -2,7 +2,7 @@
 
 'use strict'
 
-var util = require('util')
+var inherits = require('inherits')
 var AbstractIterator = require('abstract-leveldown').AbstractIterator
 var ltgt = require('ltgt')
 var mixedToBuffer = require('./util/mixed-to-buffer')
@@ -43,7 +43,7 @@ function Iterator (db, location, options) {
   this.createIterator(location, keyRange, options.reverse)
 }
 
-util.inherits(Iterator, AbstractIterator)
+inherits(Iterator, AbstractIterator)
 
 Iterator.prototype.createKeyRange = function (options) {
   var lower = ltgt.lowerBound(options)

package.json

@@ -34,6 +34,7 @@
   "dependencies": {
     "abstract-leveldown": "~5.0.0",
     "immediate": "~3.2.3",
+    "inherits": "^2.0.3",
     "ltgt": "^2.1.2",
     "typedarray-to-buffer": "~3.1.5"
   },