Revert "Vagrantfile: set disk size to minimum from AWS EBS"

Turns out the volume is already 10GB by the time the plugin has access.

This reverts commit 62df562.

Author: nerdling

Vagrantfile

@@ -1,6 +1,5 @@
 Vagrant.configure("2") do |config|
-  ## uses the vagrant-disksize plugin
-  config.disksize.size = "8GB"
+  ## Choose your base box
   config.vm.box = "ubuntu/bionic64"
   config.vm.provider "virtualbox" do |v|
     v.memory = 512