laravel install bootstrap with composer not work

laravel install bootstrap with composer not work.
I use command

composer require twbs/bootstrap:4.0.0-alpha.6

after that. I see file composer.json

"require": {
        "php": ">=5.6.4",
        "laravel/framework": "5.4.*",
        "laravel/tinker": "~1.0",
        "twbs/bootstrap": "4.0.0-alpha.6"
    },

It has a folder "twbs" in "vendor"
I try code bootstrap in welcome.blade.php but it did not work.
I do not know if I need any additional config?


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