mjml 4.5.0 on Node.js Yarn

Features

Allow social elements without links to make simple image-text lists (thanks @krystof-k)
Trigger validation warning when mj-include file is not found (#1689)
Mj-text line-height accepts negative values (#1639)
Prefix some css classes with mj- (#1620)

Update to latest Yargs to resolve vulnerable transient dependencies (thanks @hermanbanken)
Fix auto generated column classes conflicts

Due to the fix of the auto generated column classes, 3 columns with no width specified will now have a css class mj-column-per-33-333333333333336 instead of mj-column-per-33. Also, the outlook-group-fix and full-width-mobile classes have been prefixed with mj-. Be careful if you used those in a css selector.
Due to the "social elements without links" feature, a mj-social-element with neither name nor href will no longer have a <a> tag around it.