test_guess_format_for_parse_http_text_plain fails

[z3ntu]

The URL https://raw.githubusercontent.com/AGLDWG/vocpub-profile/master/validators/validator.ttl referenced in the tests returns 404.

=================================== FAILURES ===================================
_________________ test_guess_format_for_parse_http_text_plain __________________
    @pytest.mark.webtest
    def test_guess_format_for_parse_http_text_plain():
        # Any raw url of a file from GitHub will return the content-type with text/plain.
        url = "https://raw.githubusercontent.com/AGLDWG/vocpub-profile/master/validators/validator.ttl"
>       graph = Graph().parse(url)
                ^^^^^^^^^^^^^^^^^^
test/test_graph/test_graph.py:398: 

FAILED test/test_graph/test_graph.py::test_guess_format_for_parse_http_text_plain - urllib.error.HTTPError: HTTP Error 404: Not Found