doesn't support with new laravel version

Trait 'Mpociot\Firebase\SyncsWithFirebase' not found in ...

doesnt exist in vendor dir. composer require [this package] return error

Problem 1

Installation request for mpociot/laravel-firebase-sync ^1.0 -> satisfiable by mpociot/laravel-firebase-sync[1.0.0].
Conclusion: remove laravel/framework v6.4.0
Conclusion: don't install laravel/framework v6.4.0
mpociot/laravel-firebase-sync 1.0.0 requires illuminate/support ~5.0 -> satisfiable by illuminate/support[5.0.x-dev, 5.1.x-dev, 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].

illuminate/support 5.2.x-dev conflicts with laravel/framework[v6.4.0].
illuminate/support 5.3.x-dev conflicts with laravel/framework[v6.4.0].
illuminate/support 5.4.x-dev conflicts with laravel/framework[v6.4.0].
illuminate/support 5.5.x-dev conflicts with laravel/framework[v6.4.0].
don't install illuminate/support 5.6.x-dev|don't install laravel/framework v6.4.0
don't install illuminate/support 5.7.x-dev|don't install laravel/framework v6.4.0
don't install illuminate/support 5.8.x-dev|don't install laravel/framework v6.4.0
don't install illuminate/support 5.1.x-dev|don't install laravel/framework v6.4.0
don't install illuminate/support 5.0.x-dev|don't install laravel/framework v6.4.0
Installation request for laravel/framework (locked at v6.4.0, required as ^6.2) -> satisfiable by laravel/framework[v6.4.0].

mpociot / laravel-firebase-sync