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Fix letter opener gem error: "undefined method `before_filter' for LetterOpenerWeb::LettersController:Class"

Felipe Artur requested to merge fix_letter_opener into master

What does this MR do?

Fix letter opener.

Accessing http://localhost/rails/letter_opener throws an exception, updating the gem to latest version
fixes it. I believe this happened after upgrading to Rails 5.

This gem is only used on development environment.

Edited by Felipe Artur

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