title: Use a local file as the set_image file discord.py
body: <p>I am aware that in discord.py, you can make the <code>set_image</code> of an embed a url of an image. But, I want to use a local file on my computer for the <code>set_image</code> instead of a url of an image. </p>
  
  <pre><code>embed = discord.Embed(title="Title", description="Desc", color=0x00ff00)
  embed.set_image(url = "https://example.com/image.png") #this is for set_image using url
  </code></pre>
  
  <p>How can I achieve this? Is there another function or something?</p>