Remove confusing comment

Author: andreyvolokitin

lib/index.js

@@ -86,7 +86,6 @@ function getAmpPicture (imgNode, options) {
 
 function getPicture (imgNode, options) {
   imgNode.skip = true
-  // set <source> `srcset` to <img> `srcset`, if present; otherwise — use <img> `src`
   var srcset = (imgNode.attrs.srcset || imgNode.attrs[options.lazySrcset] || imgNode.attrs[options.lazySrc] || imgNode.attrs.src)
     .split(',')
     .filter(Boolean)