get gem files from Dir[] instead of git ls-files

svi.gemspec

@@ -22,7 +22,7 @@ Gem::Specification.new do |spec|
     raise "RubyGems 2.0 or newer is required to protect against public gem pushes."
   end
 
-  spec.files         = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
+  spec.files         = Dir['{bin,exe,ext,assets,integration,lib,spec,doc}/**/*', '*.gemspec', '.rspec']
   spec.bindir        = "exe"
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.extensions    = %w[ext/svi/extconf.rb]