World Magnetic Model for epoch 2020 superseeds epoch 2015

[Wlodarski]

The new coefficients have been published and can be downloaded at https://www.ngdc.noaa.gov/geomag/WMM/data/WMM2020/WMM2020COF.zip

Rename WMM.COF >> WMM.COF.txt

[cmweiss]

Thank you for bringing this to my attention. I'll take care of it as soon as my hangover is gone.

[Wlodarski]

Wow! that's some impressive hangover.

Here is some help : #13