update readme

README.md

@@ -37,7 +37,7 @@ Companion libraries are available which handle UBX © and RTCM3 © messa
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-The library implements a comprehensive set of outbound (GET) and inbound (SET/POLL) GNSS NMEA messages relating to GNSS/GPS devices, but is readily [extensible](#extensibility). Refer to `NMEA_MSGIDS` and `NMEA_MSGIDS_PROP` in [nmeatypes_core.py](https://github.com/semuconsulting/pynmeagps/blob/master/src/pynmeagps/nmeatypes_core.py) for the complete dictionary of messages currently supported. While the [NMEA 0183 protocol itself is proprietary](https://www.nmea.org/nmea-0183.html), the definitions here have been collated from public domain sources.
+The library implements a comprehensive set of outbound (GET) and inbound (SET/POLL) GNSS NMEA messages relating to GNSS/GPS devices, but is readily [extensible](#extensibility). Refer to [`NMEA_MSGIDS`](https://github.com/semuconsulting/pynmeagps/blob/master/src/pynmeagps/nmeatypes_core.py#L172) and [`NMEA_MSGIDS_PROP`](https://github.com/semuconsulting/pynmeagps/blob/master/src/pynmeagps/nmeatypes_core.py#L224) for the complete dictionary of standard and proprietary messages currently supported. While the [NMEA 0183 protocol itself is proprietary](https://www.nmea.org/nmea-0183.html), the definitions here have been collated from public domain sources.
 
 Sphinx API Documentation in HTML format is available at [https://www.semuconsulting.com/pynmeagps](https://www.semuconsulting.com/pynmeagps).