Devise: Add Ruby 2.5.0 syntax fix to an older version of devise

[vlatkapavisic]

Environment

• Ruby [2.5.3]
• Rails [4.2.7]
• Devise [3.5.10]

Issue

Hello, I'm doing an upgrade of Ruby to 2.5.3 because of a security issue. The devise version used in my app (3.5.10) has a syntax error when used with Ruby 2.5.3 : https://github.com/plataformatec/devise/commit/1009096172f2cbc86bcd54d053c89a09be67fb9f

As bumping Ruby and Devise at the same time is a bit risky, I thought of forking devise 3.5.10.
But that's not a long-term solution and I'd have to upgrade devise at some point but I have other dependency priorities currently.

Is it possible to make a PR that fixes this syntax error for devise 3.5.10?

Thanks!

[tegon]

Version 3 is not under maintenance anymore. The commit was, however, merged at the 3-stable branch, so you can change your Gemfile to use it directly from GitHub and it should work.

gem 'devise', github: 'plataformatec/devise', branch: '3-stable'