title: EntityTooSmall when uploading to S3
body: <p>I'm trying to upload a file to my S3 bucket using multipart upload. I'm following the exact same code as found <a href="https://github.com/apoorvam/aws-s3-multipart-upload/blob/master/aws-multipart-upload.go" rel="nofollow noreferrer">here</a>. The problem is, whenever it reaches the last part of my file, I get a <code>EntityTooSmall: Your proposed upload is smaller than the minimum allowed size</code> error.</p>
  
  <p>Issue: S3's multipart upload restricts file part sizes to a minimum of 5 MB</p>
  
  <p>Solution: S3 allows the last part to be less than 5 MB large</p>
  
  <p>Issue: This <strong>is</strong> my last part. And it's not being recognized. Is there anything I'm missing?</p>