add attribution requirements

tilezen / joerd

Joerd can be used to download, merge and generate tiles from digital elevation data

MIT License

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Closed kkowalsky closed 8 years ago

kkowalsky commented 8 years ago

fixes #112 changing the attribution requirements, per @nvkelso's copy.

My only question is if it's confusing to include the self-hosted requirements?

nvkelso commented 8 years ago

_italic bold text?!_ who knew!

Everything looks good, merging :)