Latest ruby version support and dependencies

[sagebomb]

We did not specified active_support, rack, json versions in gemspec and Gemfile, so last update of those gems broke our travis builds, because those gems require ruby >= 2.2.2 and travis configured to run specs on ruby 1.9.3 .. 2.3.

We specified needed versions of dependencies to pass travis' tests on all configured platforms temporarily (see gemspec and Gemfile). But we have to make a choice what to do next: use latest versions of dependencies or support old rubies.

What do you think?

[dblock]

I am not in love with the idea of requiring Ruby 2.2 on HEAD for all Grape projects just because ActiveSupport 5 does. I suggest trying to condition the dependencies in Gemfile and remove any version locking in .gemspec next. Something like this:

Gemfile:

if RUBY_VERSION ...
gem 'activesupport', '~> 4...'
elsif ...
gem 'activesupport', '~> 5...'
end

What do you think?

[nbulaj]

You can use different gemfiles and test them against different versions of gems, like it done here: doorkeeper-sequel/blob/master/.travis.yml.

[dblock]

Looking forward to some PRs!