remove extra alias
remove extra alias

the `Swift_SendmailTransport` is aliased to both `MailTransport` and `SendmailTransport`.   We can have both the 'mail' and 'sendmail' drivers build up the same class, and remove the need for the extra alias.

I think this also makes it more obvious to the reader that the 'mail' driver doesn't really exist anymore and is actually using sendmail.

halaei/framework,halaei/framework,laravel/framework,stidges/framework,jerguslejko/framework,barryvdh/framework,tomschlick/framework,mul14/laravel-framework,arturock/framework,notebowl/laravel-framework,lucasmichot/framework,ChristopheB/framework,JosephSilber/framework,stidges/framework,leo108/laravel_framework,cybercog/framework,vlakoff/framework,dwightwatson/framework,arturock/framework,barryvdh/framework,stevebauman/framework,bytestream/framework,arturock/framework,driesvints/framework,mul14/laravel-framework,lucasmichot/framework,srmkliveforks/framework,morrislaptop/framework,rodrigopedra/framework,crynobone/framework,jerguslejko/framework,laravel/framework,jerguslejko/framework,gms8994/framework,stidges/framework,vlakoff/framework,gms8994/framework,samlev/framework,vlakoff/framework,dwightwatson/framework,notebowl/laravel-framework,gms8994/framework,cybercog/framework,srmkliveforks/framework,jerguslejko/framework,cybercog/framework,mul14/laravel-framework,mul14/laravel-framework,ChristopheB/framework,rodrigopedra/framework,hafezdivandari/framework,tjbp/framework,stidges/framework,bytestream/framework,morrislaptop/framework,halaei/framework,stevebauman/framework,JamesForks/framework,tjbp/framework,srmkliveforks/framework,driesvints/framework,JamesForks/framework,gms8994/framework,rodrigopedra/framework,hafezdivandari/framework,leo108/laravel_framework,tomschlick/framework,srmkliveforks/framework,cviebrock/framework,crynobone/framework,rodrigopedra/framework,samlev/framework,cviebrock/framework,ChristopheB/framework,cviebrock/framework,cviebrock/framework,barryvdh/framework,JosephSilber/framework,tomschlick/framework,barryvdh/framework,tjbp/framework