List public Overpass API URLs. These are mirrors sampled by default when the package loads.
Details
For further details, see https://wiki.openstreetmap.org/wiki/Overpass_API#Public_Overpass_API_instances and https://github.com/ropensci/osmdata/pull/149.
See also
Other overpass:
get_overpass_url(),
set_overpass_url()
