automatically create the uploadDir folder

[fflrichard]

it will throw an error if the uploaddir folder does not exist, although i just need to write one line, i think it's more convenient that koabody can automatically create the uploadDir folder. would you please add the code?

[leo]

@fflrichard This property isn't related to koa-body. You should close this issue and add it to formidable.

[tunnckoCore]

It's not a job that they should do. And it's normal to fail.