`vagrant plugin i nstall` shows version it installed

plugins/commands/plugin/action/install_gem.rb

@@ -46,7 +46,8 @@ module VagrantPlugins
 
           # Tell the user
           env[:ui].success(I18n.t("vagrant.commands.plugin.installed",
-                                  :name => plugin_spec.name))
+                                  :name => plugin_spec.name,
+                                  :version => plugin_spec.version.to_s))
 
           # Continue
           @app.call(env)

templates/locales/en.yml

@@ -438,7 +438,7 @@ en:
         no_plugins: |-
           No plugins installed.
         installed: |-
-          Installed the '%{name}' plugin!
+          Installed the plugin '%{name} (%{version})'!
         installing: |-
           Installing the '%{name}' plugin. This can take a few minutes...
         uninstalling: |-