0.0.4
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* Fix read/write for Python 3.9

0.0.3
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* Add support for geoidal separation
* Add support for lat/long direction
* Require Python >= 3.6

0.0.2
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* Add support for disabling PPS LED
* Handle spurious newlines in sentences
* Add PDOP, VDOP and HDOP output
* Handle GLL messages

0.0.1
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* Initial Release
