fix(user-export): sanitize filenames in zip properly

Signed-off-by: Erik Michelson <github@erik.michelson.eu>

lib/web/userRouter.js

@@ -1,6 +1,7 @@
 'use strict'
 
 const archiver = require('archiver')
+const sanitizeFilename = require('sanitize-filename')
 const async = require('async')
 const Router = require('express').Router
 
@@ -92,7 +93,7 @@ UserRouter.get('/me/export', function (req, res) {
       }).then(function (notes) {
         const filenames = {}
         async.each(notes, function (note, callback) {
-          const basename = note.title.replace(/\//g, '-') // Prevent subdirectories
+          const basename = sanitizeFilename(note.title, { replacement: '_' })
           let filename
           let suffix = ''
           do {