text: Title: AttributeError: 'VisiData' object has no attribute 'addMenuItems'
  Body: I got this error when trying to run VisiData on Windows 10 WSL:
  
  ```
   Traceback (most recent call last):
     File "/home/ramrachum/.local/lib/python3.8/site-
   packages/visidata/settings.py", line 335, in loadConfigFile
       exec(code, _globals)
     File "/home/ramrachum/.visidatarc", line 220, in <module>
       vd.addMenuItems('''
   AttributeError: 'VisiData' object has no attribute 'addMenuItems'
  ```
  
  This isn't the first time I got this error, but now since I upgraded to Windows 10, it's a blocker for my talk.