v4.7.0-beta.1

Features

• Add a new head component, mj-html-attributes, which allows to add any attribute on the generated html tags using css selectors
• Add support of 'cover' and 'contain' on background-size for mj-section and mj-wrapper (thanks @Alexnortung), and other small improvements of background-images on outlook.
• Add support of 'srcset' on mj-social-element (thanks @rickytranmer)
• Add support of 'sizes' on mj-image and mj-social-element (thanks @rickytranmer)
• Add support of 'letter-spacing' on multiple components
• Automatically normalize lodash imports (thanks @TrySound)
• Expose 'ignoreIncludes' option

Fixes

• Fix mjml-migrate dependencies versions (thanks @TrySound)
• Change to new twitter share link (thanks @kitfit-dave)
• Fix support of 'font-style' on mj-navbar-link (thanks @kevingermain)
• Documentation fixes (thanks @kevingermain, @dmgawel)