update rankings date update parsing logic.

lib/ncaa/parser/html/rankings.rb

@@ -32,11 +32,14 @@ module Ncaa
 
         # @return [Time]
         def last_updated
-          @last_updated ||= begin
-            updated = html.css('figure.rankings-last-updated').text
-            date = updated[/\w+{3,}\.? \d+{1,2}, \d+{2,4}/]
-            Time.parse(date)
-          end
+          @last_updated ||=
+            begin
+              updated = html.css('figure.rankings-last-updated').text
+              date = updated[/\w+{3,}\.? \d+{1,2}\,? \d+{2,4}/]
+              Time.parse(date)
+            rescue TypeError
+              nil
+            end
         end
 
         # @return [Array<Hash>]