message: add info log to multipart build upload form
diff: @@ -80,6 +80,8 @@ fn build_form(assets: &ProjectAssets) -> Result<Form, failure::Error> {
  form = add_metadata(form, assets)?;
  form = add_files(form, assets)?;
  + info!("{:?}", &form);
  +
  Ok(form)
  }
  