Update Sunday Times Magazine UK

Merge branch 'patch-5' of https://github.com/a10kiloham/calibre

recipes/sunday_times_magazine.recipe

@@ -75,6 +75,7 @@ def get_cover_url(self):
         return cover
 
     remove_tags = [{
+        'attrs': {'class': lambda x: x and 'is-hidden' in x.split()},
         'name': ['object', 'link', 'iframe', 'base', 'meta', 'script']}, {
             'attrs': {
                 'class': [