Remove elements that are no longer void

Some obsolete elements got their void status takes away,
meaning `document.createElement(x).outerHTML` generates an opening and
closing tag, so this fix matches that behavior.

Related-to: whatwg/html#1095
Related-to: whatwg/html#2319

Closes GH-6.
Closes GH-7.

Author: mohd-akram

index.js

@@ -17,12 +17,9 @@ export const htmlVoidElements = [
   'image',
   'img',
   'input',
-  'isindex',
   'keygen',
   'link',
-  'menuitem',
   'meta',
-  'nextid',
   'param',
   'source',
   'track',

readme.md

@@ -26,7 +26,8 @@ List of HTML void tag names.
 
 This is a list of all void tag names according to HTML.
 
-> 👉 **Note**: includes ancient (such as `nextid` and `basefont`) tag names too.
+> 👉 **Note**: includes ancient (such as `basefont` and `bgsound`) tag names
+> too.
 
 ## When should I use this?
 
@@ -80,12 +81,9 @@ Yields:
   'image',
   'img',
   'input',
-  'isindex',
   'keygen',
   'link',
-  'menuitem',
   'meta',
-  'nextid',
   'param',
   'source',
   'track',