German polygons updated

Today we got informed that two counties in Niedersachsen has merged. Quoting the information we got:
"The two "Landkreise" 'Göttingen' and 'Osterode am Harz' merged an became just 'Landkreis
Göttingen'."

We have confirmed that the change exists in OpenStreetMap and imported their latest data. We could not see any other changes with our eyes when comparing the old/new polygon data, but there may be other changes. Not the least the borders might have vertex changes.

This update is in process and will be completed within a day or so.

Checkers affected and updated
GC5QHF0 - Niedersachsen-Challenge
GC525GZ - 100% Niedersachsen Challenge