chore: add backquote in readme

Author: atinux

README.md

@@ -15,8 +15,8 @@ Plug-and-play image optimization for Nuxt apps. Resize and transform your images
 
 ## Features
 
-- `<nuxt-img>` drop-in replacement for the native <img> element
-- `<nuxt-picture>` drop-in replacement for the native <picture> element.
+- `<nuxt-img>` drop-in replacement for the native `<img>` element
+- `<nuxt-picture>` drop-in replacement for the native `<picture>` element.
 - Built-in image resizer and transformer with [unjs/ipx](https://github.com/unjs/ipx)
 - Support 20+ providers
 - Generate responsive sizes