Fix minor formatting issue in breakpoint-max function in SCSS mixins

core/scss/mixins/bootstrap/_breakpoints.scss

@@ -30,7 +30,7 @@
 // `min-` and `max-` prefixes and viewports with fractional widths.
 @function breakpoint-max($name, $breakpoints: $grid-breakpoints) {
   $max: map.get($breakpoints, $name);
-  @return if($max and $max > 0, $max - .02, null);
+  @return if($max and $max > 0, $max - 0.02, null);
 }
 
 // Returns a blank string if smallest breakpoint, otherwise returns the name with a dash in front.