not working in laravel 7

[saboteador]

hi, i'm trying to use your DKIM library for laravel 7, but when i use: composer require Fossil01/laravel-dkim. It says that the version does not support laravel 7:
Problem 1
- Installation request for fossil01/laravel-dkim ^1.5 -> satisfiable by fossil01/laravel-dkim[1.5].
- Conclusion: remove laravel/framework v7.12.0
- Conclusion: don't install laravel/framework v7.12.0
- fossil01/laravel-dkim 1.5 requires laravel/framework ^5.2|^6.0 -> satisfiable by laravel/framework[5.2.x-dev, 5.3.x-dev, 5.4.x-dev, 5.5.x-dev, 5.6.x-dev, 5.7.x-dev, 5.8.x-dev, 6.x-dev].
- Can only install one of: laravel/framework[5.5.x-dev, v7.12.0].
- Can only install one of: laravel/framework[5.6.x-dev, v7.12.0].
- Can only install one of: laravel/framework[5.7.x-dev, v7.12.0].
- Can only install one of: laravel/framework[5.8.x-dev, v7.12.0].
- Can only install one of: laravel/framework[6.x-dev, v7.12.0].
- Can only install one of: laravel/framework[5.2.x-dev, v7.12.0].
- Can only install one of: laravel/framework[5.3.x-dev, v7.12.0].
- Can only install one of: laravel/framework[5.4.x-dev, v7.12.0].
- Installation request for laravel/framework (locked at v7.12.0, required as ^7.0) -> satisfiable by laravel/framework[v7.12.0].