_badge.scss in bootstrap-4.4.1

- old
+ new

@@ -1,10 +1,10 @@
 @mixin badge-variant($bg) {
   color: color-yiq($bg);
   background-color: $bg;
 
   @at-root a#{&} {
-    @include hover-focus {
+    @include hover-focus() {
       color: color-yiq($bg);
       background-color: darken($bg, 10%);
     }
 
     &:focus,