rack.gemspec in rack-1.5.4 vs rack.gemspec in rack-1.5.5

@@ -1,7 +1,7 @@
 Gem::Specification.new do |s|
   s.name            = "rack"
-  s.version         = "1.5.4"
+  s.version         = "1.5.5"
   s.platform        = Gem::Platform::RUBY
   s.summary         = "a modular Ruby webserver interface"
   s.license         = "MIT"
 
   s.description = <<-EOF