doc updated

Author: oguilleux

readme.md

@@ -7,7 +7,7 @@
 - [ES6](https://github.com/lukehoban/es6features#readme) for JavaScript (transpiling with [Babel](https://babeljs.io/) and linting with [ESLint](https://eslint.org/))
 - [SASS](http://sass-lang.com/) preprocessor for CSS with [SASS Guidelines](https://sass-guidelin.es/#the-7-1-pattern)
 - [Breakpoint slicer](https://github.com/lolmaus/breakpoint-slicer/) to write faster media queries
-- [Bootstrap 4](https://getbootstrap.com/docs/4.6/getting-started/introduction/) as CSS framework ([customizable with SASS](https://getbootstrap.com/docs/4.3/getting-started/theming/#variable-defaults))
+- [Bootstrap 4](https://getbootstrap.com/docs/4.6/getting-started/introduction/) as CSS framework ([customizable with SASS](https://getbootstrap.com/docs/4.6/getting-started/theming/#variable-defaults))
 - [Gulp 4](https://gulpjs.com/) & [Webpack 5](https://webpack.js.org/) to manage, compile and optimize theme assets
 - SVG Sprite : create a folder containing all your SVGs like `assets/src/svg/sprite` and run your watch or build