add data from Poland

[matkoniecz]

As I understand

Note that I currently only accept pull requests for country boundaries or state boundaries

PR can be made if I want.

Is this interpretation correct? I prefer to check this before starting work.

[ypid]

Basically yes, but as noted in #14, I don’t want to put too much load on Overpass API servers.

[matkoniecz]

Hopefully adding just one country will not break anything.

[matkoniecz]

Closing, because there is no good reason to keep this issue open.