Fix Ruby 2.7 v 3 positional args

[jules2689]

Ruby (https://www.ruby-lang.org/en/news/2019/12/12/separation-of-positional-and-keyword-arguments-in-ruby-3-0/) deprecated positional arguments in 2.7, it is fully unsupported in Ruby 3.0

This PR fixes a use of this deprecated pattern which was blocking the rails installer command

[julik]

Thank you for the change! Do I understand that Pecorino would simply not work for you on Ruby 2.7?

which was blocking the rails installer command

I don't want to be nitpicky but I would like to understand the problem better. I know kwargs changes have been a pain throughout the 2.x to 3.x lifecycle, but knowing how things fail exactly would help deepen my understanding. Could you paste the backtrace or the parse error that you encountered?

Also, should we add a CI run on 2.7 maybe? there is no reason for this gem to require 3.x

[julik]

Ah I see:

/Users/julik/Code/libs/pecorino/lib/pecorino.rb:8:in `require_relative': /Users/julik/Code/libs/pecorino/lib/pecorino/throttle.rb:58: syntax error, unexpected ',' (SyntaxError)
...Pecorino::LeakyBucket.new(key:, **)
...                              ^
rake aborted!
Command failed with status (1)
/Users/julik/.rbenv/versions/2.7.7/bin/bundle:23:in `load'
/Users/julik/.rbenv/versions/2.7.7/bin/bundle:23:in `<main>'

Yes, let's fix this and also add 2.7 to CI. Thanks!