rounded-3 added

Author: esdraspavon

src/support/variables/misc.scss

@@ -9,6 +9,7 @@ $border: $border-width $border-color $border-style !default;
 // Border Radius
 $border-radius-1:  4px !default;
 $border-radius-2:  6px !default;
+$border-radius-3:  8px !default;
 $border-radius: $border-radius-2 !default;
 
 // Box shadow

src/utilities/borders.scss

@@ -44,6 +44,7 @@
     .rounded#{$variant}-0 { border-radius: 0 !important; }
     .rounded#{$variant}-1 { border-radius: $border-radius-1 !important; }
     .rounded#{$variant}-2 { border-radius: $border-radius-2 !important; }
+    .rounded#{$variant}-3 { border-radius: $border-radius-3 !important; }
 
     @each $edge, $corners in $edges {
       .rounded#{$variant}-#{$edge}-0 {