Drop dependency on ruby2_keywords

[Earlopain]

Now that Ruby < 2.7 is not supported (#345) this isn't needed anymore

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.32%. Comparing base (729a91d) to head (e0368b9).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #578      +/-   ##
==========================================
- Coverage   94.34%   94.32%   -0.03%     
==========================================
  Files          17       17              
  Lines         460      458       -2     
==========================================
- Hits          434      432       -2     
  Misses         26       26              

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[tagliala]

Thanks!

We can't merge this as is because several methods are prefixed with the ruby2_keywords symbol.

[Earlopain]

Hi, the dependency is not needed anymore because ruby2_keyword methods are defined by ruby natively from 2.7 and up. It's only necesseary for downward compatibility.

$ rbenv local 2.6.10
$ irb
irb(main):001:0> RUBY_VERSION
=> "2.6.10"
irb(main):002:0> Module.respond_to?(:ruby2_keywords, true)
=> false

$ rbenv local 2.7.8
$ irb
irb(main):001:0> RUBY_VERSION
=> "2.7.8"
irb(main):002:0> Module.respond_to?(:ruby2_keywords, true)
=> true

[javierjulio]

Ok thanks!