Update README.md
Update README.md
Returned success code from regression_test.py.

So now I can add a pre-commit hook that won't let me commit broken code,
which I couldn't do before. That is:

    #!/bin/bash
    source .venv/bin/activate
    python regression_test.py
Merge pull request #18 from arxanas/test-return-success-code

Returned success code from regression_test.py.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	README.md
Fix #8: spacing around semicolons in for-loop must be consistent.