Minor changes to caveats in README for v1b1

@nickb you can poke the updated README into b1 when you rename the RC if that's easy, otherwise no worries.

gridded_glm/PACKAGE_README.md

@@ -90,8 +90,9 @@ Create a gridded product file and tiles
 The following issues are known to affect this release
 
 - The DQF (data quality flags) are always set to 0 in this version. Proper data quality information will be added in a future version
-- In the default processing mode (not "realtime" mode), if the first 20-second file of the minute is not specified, the output file time will be offset from the nominal minute boundaries. This will be addressed in a future release, but note that it is recommended to provide all 3 20-second input files.
+- In the default processing mode (not "realtime" mode), if the first 20-second file of the minute is not specified, the output file time will be offset from the nominal minute boundaries. This will be addressed in a future release, but note that it is recommended to provide all 3 20-second input files, or to run in "realtime mode" (option `-1`).
 - Tile generation with CONUS and mesoscale gridding has not been fully tested
+- The secondary script "cspp-geo-gglm-make-grids.sh" has not been fully tested
 
 
 ## REFERENCES