Fix service provider namespace typo

Merge branch 'master' of https://github.com/GENL/laravel-broadcast-te…

…sting

Change the namespace to Genl\BroadcastTesting\

1.0.2

Replace TestBroadcaster by BroadcastTesting in the aliases

Add support of PHP 7.3 and less and also support of Laravel 6

1.0.1

Add support of PHP 7.3 and less.

Add support of Laravel 8

1.0.0

Replace Jlnk by Genl