Update snippet to rails 5 syntax

[AdamDemirel]

Summary

Updated the syntax of the snippet to rails 5. Specifically, converted => into to:

[rails-bot]

Thanks for the pull request, and welcome! The Rails team is excited to review your changes, and you should hear from @georgeclaghorn (or someone else) soon.

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[kamipo]

Thanks! In the future, you can add [ci skip] to your commit message for documentation-only changes to skip the Travis build.