Custom cache driver in 5.5

Hi,

I have 2 other apps running on 5.3 and both are using this cache driver: https://github.com/ethanhann/Laravel-RedisStore

i am creating a 3rd app and want to use the same cache driver but in laravel 5.5 i'm constantly getting an error saying that Driver [ehann-redis] is not supported.

the thing is that as soon as i change the redis.driver config value to ehann-redis] it's immediately failing. the AppServiceProvider's boot method is not even beeing called. also my custom CacheServiceProvider.php file isn't beeing called.

AppServiceProvider.php

Cache::extend('ehann-redis', function ($app) {
            return Cache::repository(new \Ehann\Cache\RedisStore(
                $app['redis'],
                $app['config']['cache.prefix'],
                $app['config']['cache.stores.redis.connection']
            ));
        });

config/cache.php

'redis' => [
            'driver' => 'ehann-redis',
            'connection' => 'default',
        ]

I also logged an issue on this in november but nothing happened on that.

Does anybody expierenced the same or has an idea how to get this fixed?

thanks