fix: observed is not exported since traitlets 5.8

See ipython/traitlets#831

packages/vaex-jupyter/vaex/jupyter/widgets.py

@@ -1,13 +1,17 @@
 from __future__ import absolute_import
+
+import os
+
 import ipyvuetify as v
 import ipywidgets as widgets
 import traitlets
 from traitlets import *  # noqa
-from . import traitlets as vt
-import os
+from traitlets import Dict, observe
 
 import vaex.jupyter
 
+from . import traitlets as vt
+
 
 def load_template(filename):
     with open(os.path.join(os.path.dirname(__file__), filename)) as f:
@@ -558,6 +562,7 @@ def _template(self):
 import ipyvuetify as v
 import traitlets
 
+
 class SettingsEditor(v.VuetifyTemplate):
     template_file = os.path.join(os.path.dirname(__file__), "vue/vjsf.vue")