Hi there,

First of all, thanks for creating and maintaining this project. I love it! ❤️

Secondly, this is a feature request: As a visitor, I'd like to know when a method was introduced to a class in Ruby.

For example: Array#sum was introduced in Ruby 2.4, so it doesn't exist for Ruby 2.3: https://rubyapi.org/2.3/o/array

I think it would be useful to show something like this:

(image taken from https://apidock.com/ruby/v2_5_5/Array/sum)

If you think this is a good idea, I could take a stab at it. Also, I'd love to know what you think if it's not a feature you want to add.

Please let me know.

Thanks!