输入composer require laravel/socialite出现了问题

    - Conclusion: remove laravel/framework v5.3.30
    - Conclusion: don't install laravel/framework v5.3.30
    - laravel/socialite v3.0.0 requires illuminate/contracts ~5.4 -> satisfiable by illuminate/contracts[v5.4.0, v5.4.13, v5.4.9].
    - laravel/socialite v3.0.2 requires illuminate/contracts ~5.4 -> satisfiable by illuminate/contracts[v5.4.0, v5.4.13, v5.4.9].
    - laravel/socialite v3.0.3 requires illuminate/contracts ~5.4 -> satisfiable by illuminate/contracts[v5.4.0, v5.4.13, v5.4.9].
    - don't install illuminate/contracts v5.4.0|don't install laravel/framework v5.3.30
    - don't install illuminate/contracts v5.4.13|don't install laravel/framework v5.3.30
    - don't install illuminate/contracts v5.4.9|don't install laravel/framework v5.3.30
    - Installation request for laravel/framework (locked at v5.3.30, required as 5.3.*) -> satisfiable by laravel/framework[v5.3.30].