Automatic SiteMap Generator for laravel ! i Cant install spatie/laravel from github , i am using laravel 5.4.*?

i get this error when i try to install spatie/laravel from github.

```

Problem 1
    - Conclusion: remove laravel/framework v5.4.36
    - Conclusion: don't install laravel/framework v5.4.36
    - spatie/laravel-sitemap 3.3.0 requires illuminate/support ~5.5.0 -> satisfiable by illuminate/support[v5.5.0, v5.5.16, v5.5.17, v5.5.2, v5.5.28, v5.5.33].
    - spatie/laravel-sitemap 3.3.1 requires illuminate/support ~5.5.0 -> satisfiable by illuminate/support[v5.5.0, v5.5.16, v5.5.17, v5.5.2, v5.5.28, v5.5.33].
    - don't install illuminate/support v5.5.0|don't install laravel/framework v5.4.36
    - don't install illuminate/support v5.5.16|don't install laravel/framework v5.4.36
    - don't install illuminate/support v5.5.17|don't install laravel/framework v5.4.36
    - don't install illuminate/support v5.5.2|don't install laravel/framework v5.4.36
    - don't install illuminate/support v5.5.28|don't install laravel/framework v5.4.36
    - don't install illuminate/support v5.5.33|don't install laravel/framework v5.4.36
    - Installation request for laravel/framework (locked at v5.4.36, required as 5.4.*) -> satisfiable by laravel/framework[v5.4.36].
    - Installation request for spatie/laravel-sitemap ^3.3 -> satisfiable by spatie/laravel-sitemap[3.3.0, 3.3.1].

```

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