Don't use native padStart

This allows Node.js 6.x usage

Fixes #45

Author: bdukes

package.json

@@ -89,6 +89,7 @@
     "gulp": "^3.9.1",
     "gulp-ejs": "^3.1.3",
     "gulp-zip": "^4.1.0",
+    "lodash": "4.17.10",
     "merge-stream": "^1.0.1",
     "package-json": "^4.0.1",
     "semver": "5.5.0",

utility/index.js

@@ -1,5 +1,6 @@
 'use strict';
 
+const { padStart } = require('lodash');
 const { formatPackageUpgrades } = require('./ui');
 const { getLibraries, getUpgradeVersions } = require('./packages');
 
@@ -14,7 +15,7 @@ function formatVersionFolder(version) {
 
 	return version
 		.split('.')
-		.map(n => n.padStart(versionFolderPadding, '0'))
+		.map(n => padStart(n, versionFolderPadding, '0'))
 		.join('_');
 }
 

yarn.lock

@@ -2745,6 +2745,10 @@ lodash.templatesettings@^3.0.0:
     lodash._reinterpolate "^3.0.0"
     lodash.escape "^3.0.0"
 
+lodash@4.17.10:
+  version "4.17.10"
+  resolved "https://www.myget.org/F/dnn-software-public/npm/lodash/-/lodash-4.17.10.tgz#1b7793cf7259ea38fb3661d4d38b3260af8ae4e7"
+
 lodash@^3.3.1:
   version "3.10.1"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-3.10.1.tgz#5bf45e8e49ba4189e17d482789dfd15bd140b7b6"