NMEA Heading is not parsed using regex #184
Description
Heading messages ($HDT) are not parsed due to missing regex for those in https://github.com/ros-drivers/nmea_navsat_driver/blob/master/src/libnmea_navsat_driver/parser.py#L288
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Heading messages ($HDT) are not parsed due to missing regex for those in https://github.com/ros-drivers/nmea_navsat_driver/blob/master/src/libnmea_navsat_driver/parser.py#L288