Why has coverage been locked to `==4.0.3` for two years? Why not `>=4.0.0`?

If I add localstack to my pipenv, I can't lock because of this unnecessary dependency.
""" Whether or not we are running in a CI environment """
    for key in ('CI', 'TRAVIS'):
        if os.environ.get(key, '') not in [False, '', '0', 'false']:
            return True
    return False
def in_docker():
    return config.in_docker()
def is_port_open(port_or_url):
    port = port_or_url
    host = '127.0.0.1'
    if isinstance(port, six.string_types):
        url = urlparse(port_or_url)
        port = url.port
        host = url.hostname
    with closing(socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as sock:
        sock.settimeout(1)
        result = sock.connect_ex((host, port))
        return result == 0
def wait_for_port_open(port, retries=10, sleep_time=0.5):
    for i in range(0, retries):
        if is_port_open(port):
            break
        time.sleep(sleep_time)
def timestamp(time=None, format=TIMESTAMP_FORMAT):
    if not time:
        time = datetime.utcnow()
    if isinstance(time, six.integer_types + (float, )):
        time = datetime.fromtimestamp(time)
    return time.strftime(format)
def retry(function, retries=3, sleep=1, sleep_before=0, **kwargs):