Doesn't install on Laravel 5.6.15

[euperia]

Having difficulty installing the blog on Laravel 5.6.15 / PHP 7.2.3.

Fresh Install of laravel and Laralum

$ composer require laralum/blog                                                         
Using version ^1.3 for laralum/blog
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Conclusion: don't install laralum/blog 1.3.5
    - Conclusion: don't install laralum/blog 1.3.4
    - Conclusion: don't install laralum/blog 1.3.3
    - Conclusion: don't install laralum/blog 1.3.2
    - Conclusion: don't install laralum/blog 1.3.1
    - Conclusion: remove laravel/framework v5.6.15
    - Installation request for laralum/blog ^1.3 -> satisfiable by laralum/blog[1.3.0, 1.3.1, 1.3.2, 1.3.3, 1.3.4, 1.3.5].
    - Conclusion: don't install laravel/framework v5.6.15
    - laralum/blog 1.3.0 requires graham-campbell/markdown 7.* -> satisfiable by graham-campbell/markdown[7.1.x-dev, v7.0.0, v7.1.0].
    - graham-campbell/markdown 7.1.x-dev requires illuminate/view 5.1.*|5.2.*|5.3.*|5.4.* -> satisfiable by laravel/framework[5.4.x-dev], illuminate/view[5.1.x-dev, 5.2.x-dev, 5.3.x-dev, 5.4.x-dev, v5.1.1, v5.1.13, v5.1.16, v5.1.2, v5.1.20, v5.1.22, v5.1.25, v5.1.28, v5.1.30, v5.1.31, v5.1.41, v5.1.6, v5.1.8, v5.2.0, v5.2.19, v5.2.21, v5.2.24, v5.2.25, v5.2.26, v5.2.27, v5.2.28, v5.2.31, v5.2.32, v5.2.37, v5.2.43, v5.2.45, v5.2.6, v5.2.7, v5.3.0, v5.3.16, v5.3.23, v5.3.4, v5.4.0, v5.4.13, v5.4.17, v5.4.19, v5.4.27, v5.4.36, v5.4.9].
    - graham-campbell/markdown v7.1.0 requires illuminate/view 5.1.*|5.2.*|5.3.*|5.4.* -> satisfiable by laravel/framework[5.4.x-dev], illuminate/view[5.1.x-dev, 5.2.x-dev, 5.3.x-dev, 5.4.x-dev, v5.1.1, v5.1.13, v5.1.16, v5.1.2, v5.1.20, v5.1.22, v5.1.25, v5.1.28, v5.1.30, v5.1.31, v5.1.41, v5.1.6, v5.1.8, v5.2.0, v5.2.19, v5.2.21, v5.2.24, v5.2.25, v5.2.26, v5.2.27, v5.2.28, v5.2.31, v5.2.32, v5.2.37, v5.2.43, v5.2.45, v5.2.6, v5.2.7, v5.3.0, v5.3.16, v5.3.23, v5.3.4, v5.4.0, v5.4.13, v5.4.17, v5.4.19, v5.4.27, v5.4.36, v5.4.9].
    - graham-campbell/markdown v7.0.0 requires illuminate/view 5.1.*|5.2.*|5.3.* -> satisfiable by illuminate/view[5.1.x-dev, 5.2.x-dev, 5.3.x-dev, v5.1.1, v5.1.13, v5.1.16, v5.1.2, v5.1.20, v5.1.22, v5.1.25, v5.1.28, v5.1.30, v5.1.31, v5.1.41, v5.1.6, v5.1.8, v5.2.0, v5.2.19, v5.2.21, v5.2.24, v5.2.25, v5.2.26, v5.2.27, v5.2.28, v5.2.31, v5.2.32, v5.2.37, v5.2.43, v5.2.45, v5.2.6, v5.2.7, v5.3.0, v5.3.16, v5.3.23, v5.3.4].
    - Can only install one of: laravel/framework[5.4.x-dev, v5.6.15].
    - don't install illuminate/view 5.1.x-dev|don't install laravel/framework v5.6.15
    - don't install illuminate/view 5.2.x-dev|don't install laravel/framework v5.6.15
    - don't install illuminate/view 5.3.x-dev|don't install laravel/framework v5.6.15
    - don't install illuminate/view 5.4.x-dev|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.1.1|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.1.13|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.1.16|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.1.2|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.1.20|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.1.22|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.1.25|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.1.28|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.1.30|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.1.31|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.1.41|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.1.6|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.1.8|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.2.0|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.2.19|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.2.21|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.2.24|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.2.25|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.2.26|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.2.27|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.2.28|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.2.31|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.2.32|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.2.37|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.2.43|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.2.45|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.2.6|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.2.7|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.3.0|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.3.16|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.3.23|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.3.4|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.4.0|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.4.13|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.4.17|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.4.19|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.4.27|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.4.36|don't install laravel/framework v5.6.15
    - don't install illuminate/view v5.4.9|don't install laravel/framework v5.6.15
    - Installation request for laravel/framework (locked at v5.6.15, required as 5.6.*) -> satisfiable by laravel/framework[v5.6.15].


Installation failed, reverting ./composer.json to its original content