Http adapter is now configurable, warning: cUrl adapter is default now
Now you can configure a http adapter you want to use for Mailer.
WARNING: instead of Guzzle6 now cUrl will be used as default http adapter.
If you want to continue to use Guzzle6 you have to add guzzle to your project dependencies and set httpAdapter
attribute to Ivory\HttpAdapter\Guzzle6HttpAdapter