Update defaults in readme

README.md

@@ -128,10 +128,9 @@ allowedTags: [
 disallowedTagsMode: 'discard',
 allowedAttributes: {
   a: [ 'href', 'name', 'target' ],
-  // We don't currently allow img itself by default, but this
-  // would make sense if we did. You could add srcset here,
-  // and if you do the URL is checked for safety
-  img: [ 'src' ]
+  // We don't currently allow img itself by default, but
+  // these attributes would make sense if we did.
+  img: [ 'src', 'srcset', 'alt', 'title', 'width', 'height', 'loading' ]
 },
 // Lots of these won't come up by default because we don't allow them
 selfClosing: [ 'img', 'br', 'hr', 'area', 'base', 'basefont', 'input', 'link', 'meta' ],