Update Vagrant box

Author: ar2rsawseen

Vagrantfile

@@ -13,7 +13,7 @@ Vagrant.configure("2") do |config|
 
   # Every Vagrant development environment requires a box. You can search for
   # boxes at https://vagrantcloud.com/search.
-  config.vm.box = "bento/ubuntu-16.04"
+  config.vm.box = "ubuntu/xenial64"
 
   # Disable automatic box update checking. If you disable this, then
   # boxes will only be checked for updates when the user runs