Georaptor

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**Minor change**

- Upgraded to Python 3
- Update README

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**Minor change**

- Apache v2.0 License added.

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**Minor change**

- License modified.
- Minimum requirement of 32 geohashes removed.

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**Minor change**

- Print statement removed from the compress function.

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**Improvements**

- Added support for geohash size limitation with ``minlevel`` and ``maxlevel`` parameters.