Expand list of void elements to match spec from...

Expand list of void elements to match spec from https://html.spec.whatwg.org/multipage/syntax.html#void-elements

actionview/lib/action_view/helpers/tag_helper.rb

@@ -30,7 +30,7 @@ class TagBuilder #:nodoc:
         include CaptureHelper
         include OutputSafetyHelper
 
-        VOID_ELEMENTS = %i(base br col embed hr img input keygen link meta param source track wbr).to_set
+        VOID_ELEMENTS = %i(area base br col embed hr img input keygen link meta param source track wbr).to_set
 
         def initialize(view_context)
           @view_context = view_context