Update README
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## Known users of libavifinfo
- [Chromium](https://source.chromium.org/chromium/chromium/src/+/main:third_party/libavifinfo)
- uses the C impl to extract the gain map item for HDR tone mapping.
+ uses the C impl to extract the gain map item for HDR tone mapping (removed in
+ [Oct 2024](https://chromium.googlesource.com/chromium/src.git/+/fb254cbc7fd97f14fb869b79aca597e62f6125a6)).
- [PHP-src](https://github.com/php/php-src/tree/master/ext/standard/libavifinfo)
uses the C impl to parse image features without relying on libavif or libheif.
- [WordPress](https://github.com/WordPress/wordpress-develop/blob/trunk/src/wp-includes/class-avif-info.php)
