Fix bug.

app/models/bulletin_link.rb

@@ -19,7 +19,7 @@ class BulletinLink
   def add_http
     tmp = self.url
     unless tmp.match(/^http(s|):\/\//) || tmp.blank? || tmp.start_with?('/')
-      self.url = 'http://' + tmp
+      self.url = 'https://' + tmp
     end
   end