Update README for GSL versions

src/scripts/README.md

@@ -10,5 +10,15 @@ src/scripts/copy_gsl.sh [source_dir] src/gsl src/scripts/gsl_files.mkf
 src/scripts/process_gsl.sh src/gsl
 ```
 
-The scripts were written with GSL 2.7.1.
+The scripts were originally written with GSL 2.7.1
+and later updated for GSL 2.8.
 Modification may be necessary for newer versions.
+
+## Notes for GSL 2.8 (2024.07.19)
+Most files used remain unchanged from 2.7.1; changes were limited to:
+* Addition of "#include <stdlib.h>" in exp.c, hyperg_U.c, poch.c
+  (all in specfun/)
+* Use of abs() or fabs((double)()) instead of fabs() for int parameters;
+  cast_fabs_arg_double() in process_gsl.sh is no longer necessary
+* Addition of Lebedev quadrature-related funs in integration/gsl_integration.h;
+  to be commented out