remove mkdirp use

node 10.12 has { recursive: true }

src/updater.js

@@ -16,8 +16,8 @@ var apps = require('./apps.js'),
     debug = require('debug')('box:updater'),
     df = require('@sindresorhus/df'),
     eventlog = require('./eventlog.js'),
+    fs = require('fs'),
     locker = require('./locker.js'),
-    mkdirp = require('mkdirp'),
     os = require('os'),
     path = require('path'),
     paths = require('./paths.js'),
@@ -121,7 +121,7 @@ function downloadAndVerifyRelease(updateInfo, callback) {
         downloadUrl.bind(null, updateInfo.sourceTarballUrl, `${paths.UPDATE_DIR}/box.tar.gz`),
         downloadUrl.bind(null, updateInfo.sourceTarballSigUrl, `${paths.UPDATE_DIR}/box.tar.gz.sig`),
         gpgVerify.bind(null, `${paths.UPDATE_DIR}/box.tar.gz`, `${paths.UPDATE_DIR}/box.tar.gz.sig`),
-        mkdirp.bind(null, newBoxSource),
+        fs.mkdir.bind(null, newBoxSource, { recursive: true }),
         extractTarball.bind(null, `${paths.UPDATE_DIR}/box.tar.gz`, newBoxSource)
     ], function (error) {
         if (error) return callback(error);