Restore code coverage button

Author: JimBobSquarePants

README.md

@@ -9,6 +9,7 @@ SixLabors.ImageSharp
 <div align="center">
 
 [![Build Status](https://img.shields.io/github/workflow/status/SixLabors/ImageSharp/Build/master)](https://github.com/SixLabors/ImageSharp/actions)
+[![Code coverage](https://codecov.io/gh/SixLabors/ImageSharp/branch/master/graph/badge.svg)](https://codecov.io/gh/SixLabors/ImageSharp)
 [![GitHub license](https://img.shields.io/badge/license-Apache%202-blue.svg)](https://raw.githubusercontent.com/SixLabors/ImageSharp/master/LICENSE)
 [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/ImageSharp/General?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 [![Twitter](https://img.shields.io/twitter/url/http/shields.io.svg?style=flat&logo=twitter)](https://twitter.com/intent/tweet?hashtags=imagesharp,dotnet,oss&text=ImageSharp.+A+new+cross-platform+2D+graphics+API+in+C%23&url=https%3a%2f%2fgithub.com%2fSixLabors%2fImageSharp&via=sixlabors)
@@ -46,13 +47,6 @@ The **ImageSharp** library is made up of multiple packages:
   - Transform methods like Resize, Crop, Skew, Rotate - anything that alters the dimensions of the image
   - Non-transform methods like Gaussian Blur, Pixelate, Edge Detection - anything that maintains the original image dimensions
 
-<!--
-### Build Status
-
-|Build Status|Code Coverage|
-|:----------:|:-----------:|
-|[![Build Status](https://img.shields.io/github/workflow/status/SixLabors/ImageSharp/Build/master)](https://github.com/SixLabors/ImageSharp/actions)|[![Code coverage](https://codecov.io/gh/SixLabors/ImageSharp/branch/master/graph/badge.svg)](https://codecov.io/gh/SixLabors/ImageSharp)|
--->
 ### Questions?
 
 - Do you have questions? We are happy to help! Please [join our gitter channel](https://gitter.im/ImageSharp/General), or ask them on [stackoverflow](https://stackoverflow.com) using the `ImageSharp` tag. **Do not** open issues for questions!