README.md in inline_svg-1.8.0 vs README.md in inline_svg-1.9.0

@@ -12,11 +12,11 @@
 
 Inline SVG supports:
 
 - [Rails 5](http://weblog.rubyonrails.org/2016/6/30/Rails-5-0-final/) (from [v0.10.0](https://github.com/jamesmartin/inline_svg/releases/tag/v0.10.0))
 - [Rails 6](https://weblog.rubyonrails.org/2019/4/24/Rails-6-0-rc1-released/) with Sprockets or Webpacker (from [v1.5.2](https://github.com/jamesmartin/inline_svg/releases/tag/v1.5.2)).
-- [Rails 7](https://weblog.rubyonrails.org/2021/12/6/Rails-7-0-rc-1-released/) (experimental)
+- [Rails 7](https://weblog.rubyonrails.org/2021/12/6/Rails-7-0-rc-1-released/)
 
 Inline SVG no longer officially supports Rails 3 or Rails 4 (although they may still work). In order to reduce the maintenance cost of this project we now follow the [Rails Maintenance Policy](https://guides.rubyonrails.org/maintenance_policy.html).
 
 ## Changelog
 
@@ -95,10 +95,11 @@
 `size`                  | set width and height attributes on the SVG <br/> Can also be set using `height` and/or `width` attributes, which take precedence over `size` <br/> Supplied as "{Width} * {Height}" or "{Number}", so "30px\*45px" becomes `width="30px"` and `height="45px"`, and "50%" becomes `width="50%"` and `height="50%"`
 `title`                 | add a \<title\> node inside the top level of the SVG document
 `desc`                  | add a \<desc\> node inside the top level of the SVG document
 `nocomment`             | remove comment tags from the SVG document
 `preserve_aspect_ratio` | adds a `preserveAspectRatio` attribute to the SVG
+`view_box`              | adds a `viewBox` attribute to the SVG
 `aria`                  | adds common accessibility attributes to the SVG (see [PR #34](https://github.com/jamesmartin/inline_svg/pull/34#issue-152062674) for details)
 `aria_hidden`           | adds the `aria-hidden=true` attribute to the SVG
 `fallback`              | set fallback SVG document
 
 Example:
@@ -112,9 +113,10 @@
   size: '30% * 20%',
   title: 'Some Title',
   desc: 'Some description',
   nocomment: true,
   preserve_aspect_ratio: 'xMaxYMax meet',
+  view_box: '0 0 100 100',
   aria: true,
   aria_hidden: true,
   fallback: 'fallback-document.svg'
 )
 ```