Resolve "xcor.py, --random-source fails if file is too small"

Jeremy Mathews
2019-09-12T16:45:58-05:00

Closes #30

## PR checklist
- [X] This comment contains a description of changes (with reason)
- [X] If you've fixed a bug or added code that should be tested, add tests!
- [X] `CHANGELOG.md` is updated