Docs: Update `composer require` command to download current v4 alpha version (#20328)

diff --git a/docs/getting-started/download.md b/docs/getting-started/download.md
index 7ee6feceeca9fbf8b5cf033a05ee62748f02ba73..37fbbaa599a258aa17c800583c4e9ee5c7ea6fdc 100644 (file)
--- a/docs/getting-started/download.md
+++ b/docs/getting-started/download.md
@@ -78,7 +78,7 @@ $ meteor add twbs:bootstrap@={{ site.current_version }}
 You can also install and manage Bootstrap's Sass and JavaScript using [Composer](https://getcomposer.org):
 
 {% highlight bash %}
-$ composer require twbs/bootstrap
+$ composer require twbs/bootstrap:{{ site.current_version }}
 {% endhighlight %}
 
 ### Bower