ModuleNotFoundError in Threads notebook #314

The import statement for tutorial.threads in the first code-cell in Higher level interface: concurrent.futures is yielding a ModuleNotFoundError

The statement:
from tutorial.threads import parallel_work, sequential_work

To Reproduce
Run all cells until ModuleNotFound Error

Expected behavior
Importing the module threads

Screenshots
If applicable, add screenshots to help explain your problem.

Where did you run the tutorial?
The tutorial was run in renkulab

Fix
the statement should be changed to

from tutorial.quiz.threads import parallel_work, sequential_work