deprecation ruby 3.5.0 ostruct

[axlekb]

Ruby 3.5.0 is removing ostruct from the standard library, so this gem will need to add ostruct as a dependency.

/app/vendor/bundle/ruby/3.3.0/gems/prawn-rails-1.4.2/lib/prawn-rails/config.rb:1: 
warning: /app/vendor/ruby-3.3.5/lib/ruby/3.3.0/ostruct.rb was loaded from the standard library, 
but will no longer be part of the default gems starting from Ruby 3.5.0.

[westonganger]

This was resolved in #51 and released in version v1.5.0