Jdcal is unpinned!

Created originally on Bitbucket by chrislococo-wf (Christopher LoCoco)

Greetings!

It seems like jdcal is going back into development after a long hiatus. Currently they just had a mishap where they accidentally deleted the long existing 1.0 release and now have a 1.2 release instead. I noticed your library uses jdcal, but does not have it pinned, so I recommend modifying your setup.py to include a jdcal==1.2 pin in your requirements.

Relevant github issue can be found here: https://github.com/phn/jdcal/issues/5#issuecomment-155649490