Fix linting error

Author: pacso

lib/ice_cube/rule.rb

@@ -36,8 +36,8 @@ def self.from_ical(ical)
     end
 
     # Yaml implementation
-    def to_yaml(*args)
-      YAML.dump(to_hash, *args)
+    def to_yaml(*)
+      YAML.dump(to_hash, *)
     end
 
     # From yaml