Merge pull request iwasherefirst2#10 from iwasherefirst2/extract-config

Extract config

Merge pull request iwasherefirst2#6 from AlirezaSedghi/master

fix make new Mailer instance in laravel 7

Add mocking feature

Add config option to allow
direct use of Mail facade.
This enables the se of the
mocking feature from Laravel,

Update README.md

Add hint for optional provider parameter

Fix mailer stroing bug

Update README.md

Refactoring Core and added 100% CodeCoverage

For SMTP CodeCoverage support, it was neccesary
to communicate with MailTrapi API to confirm
if mail was acutally send.

Refactoed MultiMailer

Do not require credentials with log driver

When log driver where used, exception where thrown
when user/pass were missing. Since there are not
needed for log driver, this exception won't be thrown
in this case any longer.