docs(README): add coverage badge

Author: JonasKruckenberg

README.md

@@ -2,9 +2,10 @@
 <!-- Demo gif -->
 
 <!-- badges -->
+[![codecov](https://codecov.io/gh/JonasKruckenberg/vite-imagetools/branch/next/graph/badge.svg?token=ECD3D95LX4)](https://codecov.io/gh/JonasKruckenberg/vite-imagetools)
+![npm (tag)](https://img.shields.io/npm/v/vite-imagetools/next)
 [![standard-readme compliant](https://img.shields.io/badge/readme%20style-standard-brightgreen.svg?style=flat-square)](https://github.com/RichardLitt/standard-readme)
 [![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg)](https://github.com/semantic-release/semantic-release)
-![npm (tag)](https://img.shields.io/npm/v/vite-imagetools/next)
 
 <!-- Introduction -->
 A toolbox of custom import directives that can transform your image at compile-time.
@@ -20,7 +21,7 @@ All of the image transformations are powered by [sharp](https://sharp.pixelplumb
 - **Easy Srcset generation :link:**
 - **Fast in development mode :zap:**
 - **Extensible :jigsaw:**
-<!-- - **Image filters :art:** -->
+- **Caches transformed images to speed up CI :green_heart:**
 
 ## Table of Contents