In https://github.com/airblade/paper_trail/pull/895, Sean asked:
> .. since it looks like the next version is planned to be 6.0.0, how would
> you feel about dropping support for Rails 3 in that version? It has
> reached end of life, meaning it no longer receives security patches. We
> don't recommend that gem authors continue to support it.
To which, I responded:
> We could continue maintaining PT 5 if we had to, so I think it's
> fine to drop support for rails 3 in PT 6. If Ben agrees, I'd be
> happy to make that change. I'll just update the gemspec and drop
> testing support, for starters. We can clean up the conditionals in
> the code over time.
