the errors are nonsense; travis is claiming that pip can't find astropy-helpers on pypi even though it exists
the errors are nonsense; travis is claiming that pip can't find
astropy-helpers on pypi even though it exists

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