title: How to set `minimum` file size for upload
body: <p>I am using <a href="https://github.com/valor-software/ng2-file-upload" rel="nofollow noreferrer">ng2-file-upload</a> for file upload requirement with my angular application. in this directive i can able to set the <code>maxFileSize</code> - but the thing is, there is a way to upload just empty file. so i am looking for a solution to prevent the empty file upload.</p>
  
  <p>is there a way to test it and throw error? or can i set the min size for upload?</p>
  
  <p>here is my config:</p>
  
  <pre><code>this.uploader = new FileUploader({
    isHTML5: true,
    maxFileSize: maxFileSize, //how to set min size?
    queueLimit: queueLimit,
    autoUpload: false,
    headers: [{name: 'Content-Type', value: 'application/octet-stream'}]
  });
  </code></pre>