Write language-specific script template to file.

    Arguments:

      - fn(``string``) path to save the template to
      - lang('python', 'bash') which programming language

def write_template(fn, lang="python"):
    """
    Write language-specific script template to file.

    Arguments:

      - fn(``string``) path to save the template to
      - lang('python', 'bash') which programming language
      
    """
    with open(fn, "wb") as fh:
        if lang == "python":
            fh.write(PY_TEMPLATE)
        elif lang == "bash":
            fh.write(SH_TEMPLATE)