travis fix (thanks @bsipocz, @cdeil https://github.com/astropy/astroquery/pull/609)
travis fix (thanks @bsipocz, @cdeil
https://github.com/astropy/astroquery/pull/609)

jzuhone/spectral-cube,e-koch/spectral-cube,radio-astro-tools/spectral-cube,low-sky/spectral-cube,keflavich/spectral-cube