travis doc builds are failing with no changes

[keflavich]

e.g., https://travis-ci.org/radio-astro-tools/spectral-cube/jobs/61342410, and see #198 (comment)

  File "<stdin>", line 38
    print(darkred('reST markup error:'), file=sys.stderr)
                                             ^
SyntaxError: invalid syntax
The build_sphinx travis build FAILED because sphinx issued documentation warnings (scroll up to see the warnings).
Sphinx Documentation subprocess failed with return code 1

perhaps this is related to sphinx versions?

[keflavich]

@ChrisBeaumont this replaces our discussion on #198
@astrofrog has this been seen on any other affiliated packages?

[keflavich]

astropy/astropy-helpers#148 related?

[astrofrog]

Yes: astropy/astropy-helpers#148 (comment) - just a sphinx bug, and we need to skip that version.

[keflavich]

more specifically, astropy/astropy-helpers#148 (comment)

[coveralls]

Coverage remained the same at 67.06% when pulling f258721 on keflavich:sphinx_force_old into 32868c0 on radio-astro-tools:master.