Consider using keyword arguments and require Ruby 2.1

[mikz]

Ruby 2.1 has required keyword arguments, that could clean up a lot manual checking for existence of a key in options.

Would you consider requiring Ruby 2.1 ? I'd say it is not so strict requirement, given Rails 5 will require Ruby 2.2.

See 9174022 how it looks.

[dblock]

I think it's a little too early for syntax sugar, but soon.

[dblock]

We no longer support old rubies and could very well do this now.

[duffn]

I'd consider working on this. This occurs quite often, however. https://github.com/slack-ruby/slack-ruby-client/search?q=throw+ArgumentError Do you want to review one giant PR with all of these?

[dblock]

This code is generated from a template, so make a change in that and re-run an update. One giant PR will do.