Fix path relying on default branch name

Author: thibaudcolas

README.md

@@ -1,4 +1,4 @@
-# [stylelint-config-torchbox](https://www.npmjs.com/package/stylelint-config-torchbox) [<img src="https://raw.githubusercontent.com/torchbox/stylelint-config-torchbox/master/.github/stylelint-logo.svg?sanitize=true" alt="Stylelint" width="90" height="90" align="right">](https://stylelint.io)
+# [stylelint-config-torchbox](https://www.npmjs.com/package/stylelint-config-torchbox) [<img src="https://raw.githubusercontent.com/torchbox/stylelint-config-torchbox/main/.github/stylelint-logo.svg?sanitize=true" alt="Stylelint" width="90" height="90" align="right">](https://stylelint.io)
 
 [![stylelint-config-torchbox on npm](https://img.shields.io/npm/v/stylelint-config-torchbox.svg)](https://www.npmjs.com/package/stylelint-config-torchbox) [![Build status](https://github.com/torchbox/stylelint-config-torchbox/workflows/Continuous%20Integration/badge.svg)](https://github.com/torchbox/stylelint-config-torchbox/actions)