🚀 Feature request

Current Behavior

The type ErrorMessage doesn't have an id property.

Desired Behavior

It'd be nice id?: string would be added to the type ErrorMessage and set on the outermost component that serves as error message.

Suggested Solution

Add id={this.props.id} to the outer component in ErrorMessage.

Who does this impact? Who is this

Context

• node version: v10.10.0
• module (formidable) version: 1.2.1

What are you trying to achieve or the steps to reproduce?

I'd like to use the option hash to rename my file using the a sha1 string.

form = formidable.IncomingForm({
        hash: 'sha1'
      });

  form.on('fileBegin', function(name, file) {
    if (file.name !== '') {
      var ext