Add variable for font family

Author: brunowego

awesome-bootstrap-checkbox.scss

@@ -2,6 +2,8 @@
 // Checkboxes
 // --------------------------------------------------
 
+$font-family-icon: 'FontAwesome' !default;
+
 @mixin checkbox-variant($parent, $color) {
   #{$parent} input[type="checkbox"]:checked + label{
     &::before {
@@ -61,7 +63,7 @@
     }
 
     &:checked + label::after{
-      font-family: 'FontAwesome';
+      font-family: $font-family-icon;
       content: $fa-var-check;
     }
 
@@ -192,4 +194,4 @@
 @include radio-variant('.radio-danger', $brand-danger);
 @include radio-variant('.radio-info', $brand-info);
 @include radio-variant('.radio-warning', $brand-warning);
-@include radio-variant('.radio-success', $brand-success);
+@include radio-variant('.radio-success', $brand-success);