feat(segment): support equal width

This PR adds support for equal width horizontal segments. We already have equal width in form and grid.

Author: lubber-de

src/definitions/elements/segment.less

@@ -483,6 +483,10 @@
     .ui.horizontal.segments > .segment:last-child {
       border-radius: 0 @borderRadius @borderRadius 0;
     }
+    /* Equal Width */
+    .ui[class*="equal width"].horizontal.segments > .segment {
+      width: 100%;
+    }
   }
 }