Currently, sedstacker requires astropy 0.4 or lower. This is because of some updates to astropy's Table I/O since astropy 1.0. Sherpa 4.8.1 requires astropy 1.1.2+. Since sherpa 4.8.1 has been released, Travis builds are failing because of incompatible astropy versions in sherpa and sedstacker.
There is a sedstacker branch 'no-astropy' that removes all astropy imports at the cost of losing file I/O in sedstacker. merging this branch into master would be a quick fix, but an undesirable one.
A better solution would be to update all the I/O astropy calls so they conform with the current astropy API.
Currently, sedstacker requires astropy 0.4 or lower. This is because of some updates to astropy's Table I/O since astropy 1.0. Sherpa 4.8.1 requires astropy 1.1.2+. Since sherpa 4.8.1 has been released, Travis builds are failing because of incompatible astropy versions in sherpa and sedstacker.
There is a sedstacker branch 'no-astropy' that removes all astropy imports at the cost of losing file I/O in sedstacker. merging this branch into master would be a quick fix, but an undesirable one.
A better solution would be to update all the I/O astropy calls so they conform with the current astropy API.
This issue is already documented in sedstacker (https://github.com/jbudynk/sedstacker/issues/9).