Breakage with spyder 4

[mwcraig]

There may be more issues, but at a minimum this error needs to be fixed:

Traceback (most recent call last):

  File "/Users/mattcraig/.spyder-py3/temp.py", line 8, in <module>
    from vpython import box

  File "/Users/mattcraig/development/vpython-jupyter/vpython/__init__.py", line 57, in <module>
    _warn_if_spyder_settings_wrong()

  File "/Users/mattcraig/development/vpython-jupyter/vpython/_notebook_helpers.py", line 17, in _warn_if_spyder_settings_wrong
    if not _spyder_run_setting_is_correct():

  File "/Users/mattcraig/development/vpython-jupyter/vpython/_notebook_helpers.py", line 10, in _spyder_run_setting_is_correct
    from spyder.config.main import CONF

ImportError: cannot import name 'CONF' from 'spyder.config.main' (/Users/mattcraig/miniconda3/envs/vp37/lib/python3.7/site-packages/spyder/config/main.py)