Merge pull request #2259 from milkcocoa/fix-table-valign-middle

Fix for table-valign-middle doesn't work

Author: REJack

build/scss/_table.scss

@@ -48,7 +48,7 @@
     }
   }
 
-  .table-valign-middle {
+  &.table-valign-middle {
     thead > tr > th,
     thead > tr > td,
     tbody > tr > th,