Describe the bug

When using Faker::Boolean:boolean in codewars to create a new kata it works without true_ratio being specified, but when specifying true_ratio I needed to use the syntax 'Faker::Boolean:boolean(true_ratio = 0.8)' rather than 'Faker::Boolean:boolean(true_ratio: 0.8)' which is in the boolean.md doc.

To Reproduce

The error when using "true_ratio: 0.8" was:
"Log

An error occurred while loading ./main.rb.
Failure/Error: (rand < true_ratio)

ArgumentError:
comparison of Float with Hash failed

/usr/local/bundle/gems/faker-1.8.4/lib/faker/boolean.rb:5:in `<'

/usr/local/bundle/gems/faker-1.8.4/lib/faker/boolean.rb:5:in `boolean'

./spec.rb:19:in `block in <top (required)>'

./spec.rb:18:in `times'

./spec.rb:18:in `<top (required)>'

./main.rb:2:in `<top (required)>'

No examples found."

It worked with "true_ratio = 0.8"

Expected behavior

The working code should match the boolean.md examples (in this case "true_ratio: 0.8" should not cause an error

Additional context

I am very new to Ruby and new to codewars kata creation so I do not know if this is a feature of the setup or an actual bug.