Cannot run the example

Describe the bug Now the import code in runterm.py works for the monkeytype, however, if we just want to run the program, it will show there is an import error

To Reproduce Steps to reproduce the behavior:

1. Go to example
2. Run pipenv run termfrequency/runtermfreq.py inputs/input.txt
3. See error

Expected behavior Expect to run and produce the output with the words and frequencies