Travis build failure: unreproduceable locally

Travis has been failing with the following error, and I cannot reproduce it locally.

https://travis-ci.org/astropy/astroquery/jobs/10876031

Unfortunately, this has broken master, so I think all development must halt until it's fixed.

```

=================================== FAILURES ===================================
______________________________ test_query_bibcode ______________________________
patch_post = <_pytest.monkeypatch.monkeypatch instance at 0x423bcf8>
    def test_query_bibcode(patch_post):
        result1 = simbad.core.Simbad.query_bibcode("2006ApJ*", wildcard=True)
        result2 = simbad.core.Simbad().query_bibcode("2006ApJ*", wildcard=True)
>       assert isinstance(result1, Table)
E       assert isinstance('::script::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::\n\nquery bibcode wildcard  2006ApJ*\...or bare through Sodium-like ions.\nFiles: (abstract) (no object)\nNotes: <Available at CDS: table4.dat table5.dat>\n\n', Table)
astroquery/simbad/tests/test_simbad.py:159: AssertionError
```