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
 48K	before.tar
 28K	after.tar

Metric	Before	After	Saved
Size	48K	28K	−20K (⏷ −41.7%)

whitch files was deleted?

data
-├── .github
-│   ├── workflows
-│   │   └── ci.yml
-│   └── dependabot.yml
-├── bench
-│   └── serializing.rb
 ├── lib
 │   ├── grape_entity
 │   │   ├── condition
 │   │   │   ├── base.rb
 │   │   │   ├── block_condition.rb
 │   │   │   ├── hash_condition.rb
 │   │   │   └── symbol_condition.rb
 │   │   ├── delegator
 │   │   │   ├── base.rb
 │   │   │   ├── hash_object.rb
 │   │   │   ├── openstruct_object.rb
 │   │   │   └── plain_object.rb
 │   │   ├── exposure
 │   │   │   ├── nesting_exposure
 │   │   │   │   ├── nested_exposures.rb
 │   │   │   │   └── output_builder.rb
 │   │   │   ├── base.rb
 │   │   │   ├── block_exposure.rb
 │   │   │   ├── delegator_exposure.rb
 │   │   │   ├── formatter_block_exposure.rb
 │   │   │   ├── formatter_exposure.rb
 │   │   │   ├── nesting_exposure.rb
 │   │   │   └── represent_exposure.rb
 │   │   ├── condition.rb
 │   │   ├── delegator.rb
 │   │   ├── deprecated.rb
 │   │   ├── entity.rb
 │   │   ├── exposure.rb
 │   │   ├── json.rb
 │   │   ├── options.rb
 │   │   └── version.rb
 │   ├── grape_entity.rb
 │   └── grape-entity.rb
-├── spec
-│   ├── grape_entity
-│   │   ├── exposure
-│   │   │   ├── nesting_exposure
-│   │   │   │   └── nested_exposures_spec.rb
-│   │   │   └── represent_exposure_spec.rb
-│   │   ├── entity_spec.rb
-│   │   ├── exposure_spec.rb
-│   │   ├── hash_spec.rb
-│   │   ├── json_spec.rb
-│   │   └── options_spec.rb
-│   └── spec_helper.rb
-├── .coveralls.yml
-├── .gitignore
-├── .rspec
-├── .rubocop_todo.yml
-├── .rubocop.yml
-├── .yardopts
 ├── CHANGELOG.md
-├── CONTRIBUTING.md
-├── Dangerfile
-├── Gemfile
-├── grape-entity.gemspec
-├── Guardfile
 ├── LICENSE
-├── Rakefile
 ├── README.md
-├── RELEASING.md
-└── UPGRADING.md

ps: you can see on rails repo

[yuri-zubov]

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

[numbata]

@yuri-zubov thanks for PR. Absolutely make sense!

[numbata]

May I ask you to update CHANGELOG.md ?

[yuri-zubov]

May I ask you to update CHANGELOG.md ?

done

[github-actions]

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[numbata]

Thanks @yuri-zubov! This is a nice cleanup! Merging.