What's Changed
* Rc 1.1.0 by semuadmin in https://github.com/semuconsulting/pyrtcm/pull/57
1. `PRN`, `CELLPRN` and `CELLSIG` attributes added to satellite (NSAT) and cell (NCELL) groups within parsed RTCM3 MSM payloads via `SPARTNMessage._getsatcellmaps()` function, replacing previous `sat2prn()` and `cell2prn()` helper functionality. labelmsm keyword argument signifies either RINEX (1) or Frequency Band (2) signal format for CELLSIG attribute.
**Full Changelog**: https://github.com/semuconsulting/pyrtcm/compare/v1.0.20...v1.1.0