First release and now support HSC DR3

v0.1.2 (2020-11-16)

• First release after updates to support HSC internal release DR3, which include new reruns for S19A and S20A releases. DR1 becomes unavailable now.
• Fix a problem related to how astropy.fits.open() handle password protected files. Now
  pass the urllib.request.urlopen(url) object to it instead of the URL itself.
• Fix a few Python warnings including:
  • Changes is not to !=
  • Make a copy of a certain matplotlib colormap before modifying it.
• Fix a small typo related to image cutout (by Christopher Bradshaw)
• Implementing version management by setuptools_scm here, and adding a travis CI script
  to just check that all dependencies install correctly, and upload the package to PyPi
  in case of a new version (by Francois Lanusse)
• Add a new demo notebook to compare the differences in coadd image between DR2 and
  DR3.