[HOT] Friendly reminder not to upload sample.osm during a mapping training

[maning sambale]

Hi,

See this: http://osmcha-django-staging.tilestream.net/37558836/

In case you are running a mapping workshop and use the sample.osm data
from learnosm.  Please advise mappers not to upload.

I made the same mistake before (so sorry), so please remind them or,
at the end of the training checkout Null island and delete the data.

Thanks!
-- 
cheers,
maning
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"Freedom is still the most radical idea of all" -N.Branden
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