added a SN to the list

In hopes of doing some backyard observing, I made a list in SkyTools. Included lots of double stars, given the lingering bright Moon. Updated the current data sets, comets, supernova, etc. while I was at it. Noted a bright supernova called SN 2017 eaw, around magnitude 12. Huh. In Cepheus. Maybe we'd be able to see that. I could show Rhonda her first exploding star...