Clear (committed) test run history from this project.

    Args:
        vcs (easyci.vcs.base.Vcs)

def clear_history(vcs):
    """Clear (committed) test run history from this project.

    Args:
        vcs (easyci.vcs.base.Vcs)
    """
    evidence_path = _get_committed_history_path(vcs)
    if os.path.exists(evidence_path):
        os.remove(evidence_path)