Reduce gem size by excluding test files

Author: yuri-zubov

grape-entity.gemspec

@@ -18,7 +18,6 @@ Gem::Specification.new do |s|
 
   s.add_dependency 'activesupport', '>= 3.0.0'
 
-  s.files         = `git ls-files`.split("\n")
-  s.test_files    = `git ls-files -- {test,spec}/*`.split("\n")
+  s.files         = `git ls-files lib`.split("\n") + ['CHANGELOG.md', 'LICENSE', 'README.md']
   s.require_paths = ['lib']
 end