v4.7.0-beta.2

Features

• Return the mjml json structure (thanks @DRoet)
• Include directory for monorepo packages (thanks @iamandrewluca)

Fixes

• Fix #1942 mj-html-attribute cause trailing </link></meta>
• Fix to allow empty attributes
• Upgrade yargs and drop commander (thanks @TrySound)
• Fix validate command to use the default base directory (thanks Yuri Guilherme)
• Remove extra argument in call to borderParser (thanks @FelixSchwarz)
• Code improvements (thanks @TrySound, @DRoet)
• Documentation improvements (thanks @GarryFlemings)