update the base box to work with VirtualBox 6.0

[lwiechec]

I have just updated VirtualBox to the latest 6.0 and now I cannot run WDM:

> vagrant up --provider virtualbox 2019-box
The provider 'virtualbox' that was requested to back the machine
'2019-box' is reporting that it isn't usable on this system. The
reason is shown below:

Vagrant has detected that you have a version of VirtualBox installed
that is not supported by this version of Vagrant. Please install one of
the supported versions listed below to use Vagrant:

4.0, 4.1, 4.2, 4.3, 5.0, 5.1, 5.2

A Vagrant update may also be available that adds support for the version
you specified. Please check www.vagrantup.com/downloads.html to download
the latest version.

I would like to try out WDM but I don't want to de-upgrade my system... is there a solution?

[pauby]

What version of Vagrant are you running? You're likely going to need to update that.

[lwiechec]

thanks :) after upgrading Vagrant to 2.2.5 I am able to fetch the box!