use const, template literals and arrow function

[BREAKING] drop support for Node.js < 4

index.js

@@ -4,21 +4,21 @@
 */
 'use strict';
 
-var inspect = require('util').inspect;
+const inspect = require('util').inspect;
 
-var fsLstat = require('graceful-fs').lstat;
+const fsLstat = require('graceful-fs').lstat;
 
 module.exports = function lstat(path) {
   if (typeof path !== 'string') {
-    return Promise.reject(new TypeError('Expected a file path (string), but got a non-string value ' + inspect(path) + '.'));
+    return Promise.reject(new TypeError(`Expected a file path (string), but got a non-string value ${inspect(path)}.`));
   }
 
   if (path.length === 0) {
     return Promise.reject(new Error('Expected a file path, but got \'\' (empty string).'));
   }
 
-  return new Promise(function(resolve, reject) {
-    fsLstat(path, function(err, result) {
+  return new Promise((resolve, reject) => {
+    fsLstat(path, (err, result) => {
       if (err) {
         reject(err);
         return;

package.json

@@ -32,14 +32,14 @@
     "graceful-fs": "^4.1.11"
   },
   "devDependencies": {
-    "@shinnn/eslint-config-node-legacy": "^3.0.0",
-    "create-symlink": "^0.1.0",
+    "@shinnn/eslint-config-node": "^3.0.0",
+    "create-symlink": "^0.2.0",
     "eslint": "^3.15.0",
     "nyc": "^10.1.2",
     "rmfr": "^1.0.2",
     "tape": "^4.6.3"
   },
   "eslintConfig": {
-    "extends": "@shinnn/node-legacy"
+    "extends": "@shinnn/node"
   }
 }