Utm

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* Add support for Python 3.7, 3.8 and 3.9 (54)
* Drop support for Python 3.4

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* Drop support for Python 2.6 and 3.3 (53)
* Improve documentation (50)
* Fix issue near anti-meridian when forcing zones (47)
* Improve `to_latlon()` accuracy (49)

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* Add zone checking when forced
* Implement numpy support
* Fix UTM zones boundaries

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* added optional ``strict`` option to ``to_latlon()``
* added ``LICENSE`` file

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* fixed missing zone letter for latitude 84 deg.
* fixed ``from_lat_lon()`` longitude error message
* fixed zone numbers for 32V and related regions

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* added optional ``force_zone_number`` parameter to ``from_latlon()`` (`8 <https://github.com/Turbo87/utm/pull/8>`_)
* fixed minor precision error (`9 <https://github.com/Turbo87/utm/pull/9>`_)