[TASK] Add "support" and "autoload-dev" sections to composer.json (#455)
[TASK] Add "support" and "autoload-dev" sections to composer.json (#455)

Also update the dev-master branch alias from 1.3.x-dev to 2.0.x-dev
as there will be not version 1.3.0.
jjriv/emogrifier,MyIntervals/emogrifier