Allow all versinos of laravel 6

Support Laravel 6

Support Laravel 5.8

Merge pull request spinen#44 from spinen/develop

Merge 0.3.4 into master

Merge branch 'develop'

Merge branch 'develop'

Merge pull request spinen#35 from spinen/feature/upgradeSwiftmailer

Allow Swiftmailer v6 since Laravel 5.5 requires it

Laravel 5.5 Support

Updating for laravel 5.4

Made the docs clear that it uses the log driver