ActionView::Template::Error: incompatible character encodings: UTF-8 and ASCII-8BIT

Thanks for this gem, from Internet Explorer 11 title with East Asia Coded Character (example: こんにちは) Will trigger this error.

```
ActionView::Template::Error: incompatible character encodings: UTF-8 and ASCII-8BIT

app/helpers/application_helper.rb:    8:in `display_meta_tags'
```

How can I prevent this?  

Thank you

