Reduce gem size by excluding test files

[yuri-zubov]

This pull request updates the *.gemspec file to optimize the gem package size and structure

$ gem build -o before.tar

$ git switch reduce-gem-size

$ gem build -o after.tar

$ du -sh before.tar after.tar
 24K	before.tar
 16K	after.tar

Metric	Before	After	Saved
Size	24K	16K	−8K (⏷ −33.3%)

whitch files was deleted?

data
-├── .github
-│   └── workflows
-│       └── ruby.yml
 ├── lib
 │   ├── recursive_open_struct
 │   │   ├── debug_inspect.rb
 │   │   ├── deep_dup.rb
 │   │   ├── dig.rb
 │   │   └── version.rb
 │   ├── recursive_open_struct.rb
 │   └── recursive-open-struct.rb
-├── spec
-│   ├── recursive_open_struct
-│   │   ├── debug_inspect_spec.rb
-│   │   ├── indifferent_access_spec.rb
-│   │   ├── open_struct_behavior_spec.rb
-│   │   ├── ostruct_2_0_0_spec.rb
-│   │   ├── ostruct_2_3_0_spec.rb
-│   │   ├── recursion_and_subclassing_spec.rb
-│   │   ├── recursion_spec.rb
-│   │   └── wrapping_spec.rb
-│   └── spec_helper.rb
-├── .document
-├── .gitignore
-├── .rspec
-├── .travis.yml
 ├── AUTHORS.txt
 ├── CHANGELOG.md
-├── CONTRIBUTING.md
-├── Gemfile
 ├── LICENSE.txt
-├── Rakefile
 ├── README.md
-└── recursive-open-struct.gemspec

ps: you can see on rails repo

[yuri-zubov]

The test_files directive is no longer used by RubyGems.org.

[aetherknight]

AUTHORS.txt needs to be included here as well for licensing purposes.

[aetherknight]

The change looks good, and the reduction in final archive size is nice. Note, however, that we should also include the AUTHORS.txt file in the gem archive. Once that is done, I'll do a final check, then merge.

[yuri-zubov]

The change looks good, and the reduction in final archive size is nice. Note, however, that we should also include the AUTHORS.txt file in the gem archive. Once that is done, I'll do a final check, then merge.

done

[aetherknight]

The change has been released in recursive-open-struct 2.1.1, along with some other maintenance changes for the project.