The one with PHP 7.3 + self-update

Thanks to @Loxzibit & @jflanaganuk we have 2 new important features.

PHP 7.3

PHP 7.3 is now the default. if this breaks your project because you don't have a php_version in your wf2.yml file - you'll have to add it :)

Self update.

running wf2 self-update will attempt to self-update your version, meaning you shouldn't need to do anything else.