2020-11-17: Small bug fixed; allow users to use the coadd/bg product (the deepCoadd files before the local sky subtraction applied) in DR3 to generate cutout images and color pictures.

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 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.

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