Place plugin assets here:
  banner-1544x500.png  (required)
  banner-772x250.png   (2x retina, optional)
  icon-256x256.png     (required)
  icon-128x128.png     (optional)
  screenshot-1.png     (matches readme.txt Screenshots section)
  screenshot-2.png
  screenshot-3.png
  screenshot-4.png
