[OSM-dev] Warn data consumers about the need for 64-bit node numbers

[Andrew]

The last Licence working group meeting ( https://docs.google.com/document/pub?
id=1j4wiDqukbRGNDh9kC-cUL6j3t4NhlcVgancqieHywK0 ) discussed sending an 
announcement to our users ( https://hackpad.com/2L8xdm5nMkM#Upcoming-changes-to-
the-OpenStreetMap-licence ) that the licence is changing and encouraging them to 
reimport their data. Should we add a reminder that everyone will soon need to 
treat node numbers as 64-bit?

--
Andrew