misc: Update readme

Author: Luni-4

README.md

@@ -1,8 +1,8 @@
 # A Rust JSON structural diff
 
-[![LICENSE](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
-[![Actions Status](https://github.com/Luni-4/json-structural-diff/workflows/json-structural-diff/badge.svg)](https://github.com/Luni-4/json-structural-diff/actions)
-[![Coverage Status](https://coveralls.io/repos/github/Luni-4/json-structural-diff/badge.svg?branch=master)](https://coveralls.io/github/Luni-4/json-structural-diff?branch=master)
+[![Actions Status][actions badge]][actions]
+[![CodeCov][codecov badge]][codecov]
+[![LICENSE][license badge]][license]
 
 A pure-Rust JSON structural diff based on [this](https://github.com/andreyvit/json-diff)
 implementation.
@@ -27,3 +27,13 @@ to the commands above.
 ## License
 
 Released under the [MIT License](LICENSE).
+
+<!-- Links -->
+[actions]: https://github.com/Luni-4/json-structural-diff/actions
+[codecov]: https://codecov.io/gh/Luni-4/json-structural-diff
+[license]: LICENSE
+
+<!-- Badges -->
+[actions badge]: https://github.com/Luni-4/json-structural-diff/workflows/json-structural-diff/badge.svg
+[codecov badge]: https://codecov.io/gh/Luni-4/json-structural-diff/branch/master/graph/badge.svg
+[license badge]: https://img.shields.io/badge/license-MIT-blue.svg