Suppress warnings about keyword args on Ruby 2.7
Suppress warnings about keyword args on Ruby 2.7

```
/home/runner/work/kaminari/kaminari/kaminari-core/test/helpers/paginator_tags_test.rb:9: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
/home/runner/work/kaminari/kaminari/kaminari-core/lib/kaminari/helpers/paginator.rb:10: warning: The called method `initialize' is defined here
```

kaminari/kaminari,kaminari/kaminari