Gemfile: update builder version >= 3.0.4 (#17309)

git-svn-id: http://svn.redmine.org/redmine/trunk@13196 e93f8b46-1217-0410-a6f0-8f06a7374b81

Gemfile

@@ -5,7 +5,7 @@ gem "rake", "~> 10.1.1"
 gem "jquery-rails", "~> 2.0.2"
 gem "coderay", "~> 1.1.0"
 gem "fastercsv", "~> 1.5.0", :platforms => [:mri_18, :mingw_18, :jruby]
-gem "builder", "3.0.0"
+gem "builder", ">= 3.0.4"
 gem "request_store", "1.0.5"
 gem "mime-types"