v4.4.0-beta.1

Features

• Mj-buttons are now Fully clickable ! (except on outlook)(Thanks to @hellocosmin !)
• Mj-image: Fix Alt Text, allow font-size and max-height attribute (thanks @Zelltron)
• Allow to preserve tags from being altered by juice when inlining css (#1450)
• Add an option to disable migration warnings

Fixes

• Fix Navbar ico-align attribute (#1495)
• Don't migrate null values when migrating a json template
• Fix validation regex, allow unitless line-height and paddings on navbar
• Fix for ipad display block on social image (#1441)