Update XO badge (#692)

Co-authored-by: Sindre Sorhus <sindresorhus@gmail.com>

readme.md

@@ -9,7 +9,7 @@
 > JavaScript/TypeScript linter (ESLint wrapper) with great defaults
 
 [![Coverage Status](https://codecov.io/gh/xojs/xo/branch/main/graph/badge.svg)](https://codecov.io/gh/xojs/xo/branch/main)
-[![XO code style](https://img.shields.io/badge/code_style-XO-5ed9c7.svg)](https://github.com/xojs/xo)
+[![XO code style](https://shields.io/badge/code_style-5ed9c7?logo=xo&labelColor=gray)](https://github.com/xojs/xo)
 
 Opinionated but configurable ESLint wrapper with lots of goodies included. Enforces strict and readable code. Never discuss code style on a pull request again! No decision-making. No `.eslintrc` to manage. It just works!
 
@@ -480,12 +480,14 @@ XO is based on ESLint. This project started out as just a shareable ESLint confi
 
 ## Badge
 
-Show the world you're using XO → [![XO code style](https://img.shields.io/badge/code_style-XO-5ed9c7.svg)](https://github.com/xojs/xo)
+Show the world you're using XO → [![XO code style](https://shields.io/badge/code_style-5ed9c7?logo=xo&labelColor=gray)](https://github.com/xojs/xo)
 
 ```md
-[![XO code style](https://img.shields.io/badge/code_style-XO-5ed9c7.svg)](https://github.com/xojs/xo)
+[![XO code style](https://shields.io/badge/code_style-5ed9c7?logo=xo&labelColor=gray)](https://github.com/xojs/xo)
 ```
 
+Or [customize the badge](https://github.com/xojs/xo/issues/689#issuecomment-1253127616).
+
 You can also find some nice dynamic XO badges on [badgen.net](https://badgen.net/#xo).
 
 ## Team