Run nest_asyncio.apply() automatically inside Jupyter

[g-simmons]

What does this do?

On Docs.init(), try to check if we're inside a Jupyter notebook. If so, run nest_asyncio.apply()

Test Status

• Running the code example from the README fails in Jupyter if this is not included*
• Running the code example from the README succeeds in Jupyter with this fix*
• Running the code example from the README succeeds in the terminal*

*only tested up to Docs.add()

[MilesCranmer]

Perhaps this function could be put in utils.py (outside of the class), since it doesn't use self in the method?

[whitead]

Does this work? I already have code for this here but it doesn't seem to work.