Remove imports

wo/cli/plugins/stack_upgrade.py

@@ -1,7 +1,6 @@
 import os
 import shutil
 
-from cement.core import handler, hook
 from cement.core.controller import CementBaseController, expose
 
 from wo.cli.plugins.stack_pref import post_pref, pre_pref
@@ -10,7 +9,6 @@ from wo.core.download import WODownload
 from wo.core.extract import WOExtract
 from wo.core.fileutils import WOFileUtils
 from wo.core.logging import Log
-from wo.core.services import WOService
 from wo.core.shellexec import WOShellExec
 from wo.core.variables import WOVar