improve tag icon spacing (#987)

sass/elements/tag.sass

@@ -54,6 +54,16 @@ $tag-delete-margin: 1px !default
     font-size: $size-normal
   &.is-large
     font-size: $size-medium
+  .icon
+    &:first-child:not(:last-child)
+      margin-left: -0.375em
+      margin-right: 0.1875em
+    &:last-child:not(:first-child)
+      margin-left: 0.1875em
+      margin-right: -0.375em
+    &:first-child:last-child
+      margin-left: -0.375em
+      margin-right: -0.375em
   // Modifiers
   &.is-delete
     margin-left: $tag-delete-margin