Fix missing import

Author: nvasilas

tests/test_workspacebuilder.py

@@ -10,7 +10,7 @@
 
 import libtmux
 from libtmux import Window
-from libtmux.common import has_lt_version
+from libtmux.common import has_gte_version, has_lt_version
 from libtmux.test import retry_until, temp_session
 from tmuxp import config, exc
 from tmuxp.cli.load import load_plugins