commands/box/update: show current version [GH-3467]

CHANGELOG.md

@@ -3,6 +3,7 @@
 BUG FIXES:
 
   - commands/box/remove: Make output nicer. [GH-3470]
+  - commands/box/update: Show currently installed version. [GH-3467]
   - command/rsync-auto: Works properly on Windows.
   - guests/coreos: Fix test for Docker daemon running.
   - guests/linux: Fix test for Docker provisioner whether Docker is

plugins/commands/box/command/update.rb

@@ -95,6 +95,7 @@ module VagrantPlugins
 
         def box_update(box, version, ui)
           ui.output(I18n.t("vagrant.box_update_checking", name: box.name))
+          ui.detail("Latest installed version: #{box.version}")
           ui.detail("Version constraints: #{version}")
           ui.detail("Provider: #{box.provider}")