fix: formidable option API changes

Signed-off-by: Yukai Huang <yukaihuangtw@gmail.com>

Author: Yukaii

lib/imageRouter/index.js

@@ -32,9 +32,9 @@ function checkImageValid (filepath) {
 
 // upload image
 imageRouter.post('/uploadimage', function (req, res) {
-  var form = new formidable.IncomingForm()
-
-  form.keepExtensions = true
+  var form = new formidable.IncomingForm({
+    keepExtensions: true
+  })
 
   form.parse(req, function (err, fields, files) {
     if (err || !files.image || !files.image.filepath) {