title: Support for adding lazy load for images in Markdown
body: <p>I'm using kramdown parser to convert markdown to html. I want to use lazy load for images without modifying original markdown syntax. I can achieve this by editing link.rb file in kramdown gems.</p>
  
  <p><a href="https://i.stack.imgur.com/zL6V3.png" rel="noreferrer"><img src="https://i.stack.imgur.com/zL6V3.png" alt="enter image description here"></a></p>
  
  <p>But I don't want to follow this way. Because if anyone updating kramdown I'll lose these edits. Is there anyother way to do this without modifying original image syntax?</p>
  
  <p>Original Image Syntax: <code>![](some image link)</code></p>
  
  <p>Current Output (without above edit): <code>&lt;img src="some image link" alt=""/&gt;</code></p>
  
  <p>Expected Output: <code>&lt;img data-src="some image link" alt=""/&gt;</code></p>