New release for hanami 2.x

[wuarmin]

Hey @jodosha ,

a new hanami-mailer release for hanami 2.x would be appreciated. hanami-mailer 1.3.x depends on hanami-utils 1.3

Could not find compatible versions

Because hanami >= 2.0.0 depends on hanami-utils ~> 2.0
  and hanami-mailer >= 1.3.0 depends on hanami-utils ~> 1.3,
  hanami >= 2.0.0 is incompatible with hanami-mailer >= 1.3.0.
So, because Gemfile depends on hanami ~> 2.0.3
  and Gemfile depends on hanami-mailer ~> 1.3,
  version solving has failed.

Thanks