add more precise control to =modular-scale-classes
add more precise control to =modular-scale-classes

Signed-off-by: Mason Wendell <dfb59f0c8ff950313b5e348b016c8434aeb441c7@zivtech.com>

modularscale/modularscale-sass,modularscale/modularscale-sass,modularscale/modularscale-sass