Fix vote specs for mysql

spec/lib/votes_spec.rb

@@ -178,7 +178,8 @@ describe Issue, 'Votes' do
   end
 
   def add_note(text, author = issue.author)
+    created_at = Time.now - 1.hour + Note.count.seconds
     issue.notes << create(:note, note: text, project: issue.project,
-                          author_id: author.id)
+                          author_id: author.id, created_at: created_at)
   end
 end