title: Can I use boto3 anonymously?
body: <p>With <code>boto</code> I could connect to public S3 buckets without credentials by passing the <code>anon=</code> keyword argument.</p>
  
  <pre><code>s3 = boto.connect_s3(anon=True)
  </code></pre>
  
  <p>Is this possible with <code>boto3</code>?</p>