* pyupgrade --py36-plus
* update license year
* stickler
* test invalid model in irradiance.get_sky_diffuse
* Update pvlib/atmosphere.py
Co-authored-by: Mark Mikofski <bwana.marko@yahoo.com>
* Update pvlib/location.py
Co-authored-by: Mark Mikofski <bwana.marko@yahoo.com>
* Update pvlib/modelchain.py
Co-authored-by: Mark Mikofski <bwana.marko@yahoo.com>
* Update pvlib/modelchain.py
Co-authored-by: Mark Mikofski <bwana.marko@yahoo.com>
* Update pvlib/pvsystem.py
Co-authored-by: Mark Mikofski <bwana.marko@yahoo.com>
* Update pvlib/pvsystem.py
Co-authored-by: Mark Mikofski <bwana.marko@yahoo.com>
* Update pvlib/tests/iotools/test_pvgis.py
Co-authored-by: Mark Mikofski <bwana.marko@yahoo.com>
* Update pvlib/tracking.py
Co-authored-by: Mark Mikofski <bwana.marko@yahoo.com>
* Update pvlib/tracking.py
Co-authored-by: Mark Mikofski <bwana.marko@yahoo.com>
* stickler
Co-authored-by: Mark Mikofski <bwana.marko@yahoo.com>