Include .gitattributes when building the gem (#193)

Author: pokonski

Diff for: jsbundling-rails.gemspec

@@ -9,7 +9,8 @@ Gem::Specification.new do |spec|
   spec.summary     = "Bundle and transpile JavaScript in Rails with bun, esbuild, rollup.js, or Webpack."
   spec.license     = "MIT"
 
-  spec.files = Dir["lib/**/*", "MIT-LICENSE", "README.md"]
+  spec.files = Dir.glob("lib/**/*", File::FNM_DOTMATCH).reject { |f| File.directory?(f) }
+  spec.files += ["LICENSE", "README.md"]
 
   spec.add_dependency "railties", ">= 6.0.0"
 end