Getting lots of warning when running zold

[victornoel]

Describe the bug

Everytime I run zold, its output always starts with:

/home/victor/.gem/ruby/2.7.0/gems/slop-4.6.2/lib/slop.rb:23: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
/home/victor/.gem/ruby/2.7.0/gems/slop-4.6.2/lib/slop/options.rb:27: warning: The called method `initialize' is defined here
/home/victor/.gem/ruby/2.7.0/gems/slop-4.6.2/lib/slop/options.rb:32: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
/home/victor/.gem/ruby/2.7.0/gems/slop-4.6.2/lib/slop/parser.rb:13: warning: The called method `initialize' is defined here
/home/victor/.gem/ruby/2.7.0/gems/slop-4.6.2/lib/slop/options.rb:85: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
/home/victor/.gem/ruby/2.7.0/gems/slop-4.6.2/lib/slop/options.rb:51: warning: The called method `on' is defined here
/home/victor/.gem/ruby/2.7.0/gems/slop-4.6.2/lib/slop/options.rb:55: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
/home/victor/.gem/ruby/2.7.0/gems/slop-4.6.2/lib/slop/option.rb:30: warning: The called method `initialize' is defined here

To Reproduce Steps to reproduce the behaviour:

1. install zold with ruby 2.7.0 gem install zold
2. run zold zold --help

Expected behavior

No warnings.

[0crat]

@yegor256/z please, pay attention to this issue