Don't use deprecated bundler flags

.drone.yml

@@ -21,7 +21,9 @@ steps:
     environment:
       RAILS_ENV: test
     commands:
-      - bundle install --jobs=3 --retry=3 --deployment --with development test
+      - bundle config set deployment 'true'
+      - bundle config set with 'development test'
+      - bundle install --jobs=3 --retry=3
       - yarn install
       - yarn run build:css
       - bundle exec rspec