.rultor.yml in loog-0.3.1 vs .rultor.yml in loog-0.4.0

@@ -1,6 +1,6 @@
 docker:
-  image: yegor256/rultor-image:1.9.1
+  image: yegor256/rultor-image:1.21.0
 assets:
   rubygems.yml: yegor256/home#assets/rubygems.yml
 install: |
   pdd -f /dev/null
   sudo bundle install --no-color "--gemfile=$(pwd)/Gemfile"