connection_pool.gemspec in connection_pool-2.1.0 vs connection_pool.gemspec in connection_pool-2.1.1

@@ -13,8 +13,9 @@
   s.files         = `git ls-files`.split("\n")
   s.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
   s.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
   s.require_paths = ["lib"]
   s.license = "MIT"
+  s.add_development_dependency 'bundler'
   s.add_development_dependency 'minitest', '>= 5.0.0'
   s.add_development_dependency 'rake'
 end