Add demo in init

Author: b-yogesh

chartlets.py/demo/my_extension/__init__.py

@@ -3,9 +3,11 @@
 from .my_panel_2 import panel as my_panel_2
 from .my_panel_3 import panel as my_panel_3
 from .my_panel_4 import panel as my_panel_4
+from .my_panel_5 import panel as my_panel_5
 
 ext = Extension(__name__)
 ext.add(my_panel_1)
 ext.add(my_panel_2)
 ext.add(my_panel_3)
 ext.add(my_panel_4)
+ext.add(my_panel_5)