Use lodash #flatten

Author: vladimyr

lib/utils.js

@@ -1,14 +1,9 @@
 const fs = require('fs-extra');
 const path = require('path');
 const glob = require('glob');
+const flatten = require('lodash/flatten');
 const promiseMap = require('p-map');
 
-const flatten = (arr) => {
-  return arr.reduce((acc, it) => {
-    return acc.concat(it);
-  }, []);
-};
-
 module.exports = {
   parsePlatform(pagefile) {
     return path.dirname(pagefile);