fix: config postprocessor template uses deprecated syntax (#249)

Author: gildesmarais

lib/html2rss/configs/cinemascore.com/index.yml

@@ -10,12 +10,7 @@ selectors:
     selector: "title"
     post_process:
       - name: "template"
-        string: "%s (%s) [Rated %s] (%s)"
-        methods:
-          - self
-          - grade
-          - mpaa_rating
-          - year
+        string: "%{self} (%{grade}) [Rated %{mpaa_rating}] (%{year})"
   grade:
     selector: "grade"
   movie_title: