trema.gemspec in trema-0.4.0 vs trema.gemspec in trema-0.4.1

@@ -27,9 +27,10 @@
   gem.test_files = `git ls-files -- {spec,features}/*`.split( "\n" )
 
   gem.add_dependency "bundler"
   gem.add_dependency "gli", "~> 2.8.0"
   gem.add_dependency "paper_house", "~> 0.4.0"
+  gem.add_dependency "pio", "~> 0.2.4"
   gem.add_dependency "rake", "~> 10.1.0"
   gem.add_dependency "rdoc", "~> 4.0.1"
 end