tighten gemspec

Author: chamod-gamage

zaxcel.gemspec

@@ -31,7 +31,25 @@ Gem::Specification.new do |spec|
   spec.files = Dir.chdir(__dir__) do
     %x(git ls-files -z).split("\x0").reject do |f|
       (File.expand_path(f) == __FILE__) ||
-        f.start_with?(*%w[bin/ test/ spec/ features/ .git .circleci appveyor Gemfile])
+        f.start_with?(*%w[
+          bin/
+          test/
+          spec/
+          features/
+          .git
+          .circleci
+          .github/
+          appveyor
+          Gemfile
+          vendor/
+          vendor/bundle/
+          coverage/
+          tmp/
+          docs/
+          script/
+          sorbet/
+          examples/
+        ])
     end
   end
   spec.bindir        = 'exe'