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
 16K	before.tar
 12K	after.tar

Metric	Before	After	Saved
Size	16K	12K	−4K (⏷ −25%)

whitch files was deleted?

data
-├── bin
-│   ├── console
-│   └── setup
 ├── exe
 │   ├── cucumber_booster
 │   ├── ex_unit_booster
 │   ├── go_test_booster
 │   ├── minitest_booster
 │   └── rspec_booster
 ├── lib
 │   ├── test_boosters
 │   │   ├── boosters
 │   │   │   ├── base.rb
 │   │   │   ├── cucumber.rb
 │   │   │   ├── ex_unit.rb
 │   │   │   ├── go_test.rb
 │   │   │   ├── minitest.rb
 │   │   │   └── rspec.rb
 │   │   ├── files
 │   │   │   ├── distributor.rb
 │   │   │   ├── leftover_files.rb
 │   │   │   └── split_configuration.rb
 │   │   ├── cli_parser.rb
 │   │   ├── insights_uploader.rb
 │   │   ├── job.rb
 │   │   ├── logger.rb
 │   │   ├── project_info.rb
 │   │   ├── shell.rb
 │   │   └── version.rb
 │   └── test_boosters.rb
 ├── rspec_formatters
 │   └── semaphore_rspec3_json_formatter.rb
-├── .gitignore
-├── .rspec
-├── .rubocop.yml
-├── config.reek
-├── Gemfile
 ├── LICENSE.txt
-├── Rakefile
 ├── README.md
-└── test_boosters.gemspec

ps: you can see on rails repo

[yuri-zubov]

@mikevoets, @dexyk
I see you've fixed the issue with Bundler. When do you plan to release the gem?
I suggest adding my small improvement to the release.

Thank you

[mikevoets]

@mikevoets,
I see you've fixed the issue with Bundler. When do you plan to release the gem?
I suggest adding my small improvement to the release.

Thank you

Hey, I'm not the maintainer of the gem, so I can't make new releases.